Investing 101
Investing 101 walks through every asset class in plain English: checking and high-yield savings, money market accounts, CDs, Treasury bills, notes and bonds, I bonds, EE bonds and TIPS, the bond market, the stock market, index funds, ETFs and mutual funds, 401(k), IRA and Roth accounts, and real estate, REITs, gold, crypto and annuities. Then where to start depending on whether you have savings or already invest.
Investing, explained — from your first $50 to a full portfolio
Every major place you can put money, in plain words: what it is, what it pays today, who it suits, what to watch out for, and the three clicks to do it. Nothing here is our research — every section links to the regulator or publication it comes from.
How it works
- Direct deposit in, debit card and bill-pay out.
- Insured by the FDIC (banks) or NCUA (credit unions) up to $250,000 per person, per institution, per ownership category. If the bank fails, the government pays you back.
- Many online banks and credit unions charge no monthly or overdraft fees. A fee-charging checking account is a choice, not a necessity.
✓ Good for
- Paying bills and everyday spending
- About one month of expenses as a buffer
✕ Not for
- Savings — anything above a month of bills belongs in an account that pays interest
- Emergency funds (they should earn ~4%, see Savings)
- Overdraft fees ($25–$35 each) and monthly maintenance fees — pick an account with neither.
- Fintech "checking" apps are often not banks; your money sits at a partner bank under custody rules. Prefer a chartered bank or credit union for your main account.
Do it in 3 steps
- Check your bank is really insured → FDIC BankFind↗
- Compare free checking accounts → NerdWallet↗
- Move everything above one month of bills into savings → Savings, next topic
Go deeper — if you already know the basics
- Coverage math. Per depositor, per insured bank, per ownership category. A couple's joint account carries $500,000. Complex cases: FDIC's EDIE calculator.
- Custodial fintech risk. The 2024 Synapse collapse left some app customers unable to reach funds for months because the ledger, not the bank, was the problem.
- Withdrawal limits. The federal six-per-month savings limit was suspended in 2020; some banks still enforce it by policy — a reason to keep real checking.
How it works
- Open online in ~10 minutes, link your checking account, transfer money in and out any time.
- Rates are quoted as APY (annual percentage yield), already including compounding — compare APY to APY.
- Savings rates follow the Federal Reserve within weeks: when the Fed cuts, your rate drops; a CD or Treasury locks a rate in.
✓ Good for
- Emergency fund (3–6 months of essentials)
- Money you will need within a year
- Overflow while you decide what to do with it
✕ Not for
- Money you won't touch for 5+ years — inflation slowly wins
- Locking in a rate (use a CD or Treasury)
- Teaser rates: some pay the headline rate only on the first $1,000 or for 3 months. Read the fine print.
- Direct-deposit or minimum-balance conditions.
- Interest is taxed as ordinary income; expect a 1099-INT if you earn over $10.
Do it in 3 steps
- Pick a bank from today's leaders → Today's Rates
- Confirm it is FDIC-insured → FDIC BankFind↗
- Set an automatic weekly transfer — even $10 → Emergency Fund tool
Go deeper — if you already know the basics
- On $5,000: 0.38% earns ~$19 a year, 4.10% earns ~$205 — same insurance, ten-minute switch.
- Money market accounts at a bank are savings with a debit card; money market funds at a brokerage are not insured but track T-bill yields — see the next topic.
How it works
- Account (bank): insured, often a higher minimum, sometimes a debit card; rates like high-yield savings.
- Fund (brokerage): where uninvested cash sits at Fidelity, Schwab, Vanguard; aims to hold $1.00 per share; yield follows T-bills; part of the income is state-tax-free.
✓ Good for
- Cash you keep at a brokerage between investments (fund)
- Savings you want a debit card on (account)
✕ Not for
- Anyone who wants the simplest insured option — a high-yield savings account does the same job with less to understand
- Government money funds only for cash you must not lose; "prime" funds can impose liquidity fees in a crisis.
- A bank money market account can pay less than plain savings at the same bank — compare.
Do it in 2 steps
- At a brokerage? Check which fund holds your cash and its 7-day yield
- Otherwise use a high-yield savings account → Savings
Go deeper — if you already know the basics
- One prime fund "broke the buck" in 2008 — the origin of the 2023 reforms. No government money fund ever has.
- Treasury-only funds publish each January what share of income is exempt from state tax — material in high-tax states.
How it works
- Choose a term; the rate is locked until it ends ("matures").
- Early withdrawal usually costs 3–12 months of interest, so only commit money you are sure you won't need.
- A ladder — five CDs maturing 1, 2, 3, 4, 5 years out — gives long-term rates with money freeing up every year. Build one on the Rates page.
✓ Good for
- Money with a known date: a car in 2 years, tuition in 3
- Protecting today's rate if you think rates will fall
✕ Not for
- Emergency funds (you may need them tomorrow)
- Long-term growth (stocks and bonds, over decades)
- Callable brokered CDs: the bank can end the CD early when rates fall — exactly when you want to keep it.
- Interest is taxed each year it is credited, even on a 5-year CD you haven't cashed. A Treasury of the same term skips state tax — compare after tax.
- Right now the CD "curve" is flat: 5-year CDs pay barely more than 1-year. Match the term to when you need the money; don't reach for length.
Do it in 3 steps
- Compare today's best CD for your term → Today's Rates
- Check the early-withdrawal penalty in the bank's disclosure before funding → CFPB explainer↗
- Consider a Treasury of the same term if you pay state income tax → Treasuries
Go deeper — if you already know the basics
- No-penalty CDs allow withdrawal after ~7 days at a slightly lower rate; bump-up CDs let you raise the rate once.
- Brokered CDs can be sold before maturity at market price (possibly below cost) and are often callable.
- Sometimes breaking a 5-year CD at 4.5% after 2 years, paying a 6-month penalty, still beats having bought a 1-year CD twice. Do the arithmetic.
How it works
- A bill is sold below face value and pays the full amount at the end — the difference is your interest.
- Notes and bonds pay interest every six months and return the principal at maturity.
- Buy at TreasuryDirect (non-competitive bid, you get the auction rate) or through any brokerage.
- Sell before maturity through a broker at the market price — easier than breaking a CD.
✓ Good for
- The same jobs as a CD, with state-tax savings and easier exit
- Cash you want at the very safest place
✕ Not for
- Anyone who needs the money on a specific day before maturity and can't stomach a price dip
- Prices move opposite to rates: a 10-year note loses ~7–8% of value for a 1-point rise in yields — irrelevant if you hold to maturity.
- TreasuryDirect is functional but old-fashioned; a brokerage gives a nicer interface and easy resale.
Do it in 3 steps
- See today's yields by term → Today's Rates
- Open a TreasuryDirect account (free) → TreasuryDirect↗
- Or buy Treasuries inside your brokerage account (search "Treasury auction") → How Treasuries work↗
Go deeper — if you already know the basics
- Tax-equivalent yield: in a state with a 5% income tax, a 4.0% T-bill equals a ~4.2% CD. The Rates page has a toggle for your state rate.
- Yield curve: short rates above long rates ("inverted") signal expected cuts; as of September 2026 the curve slopes up again.
- STRIPS (zero-coupon Treasuries) suit a known future date but create taxable "phantom" income outside an IRA.
How it works
- Buy any amount from $25 at TreasuryDirect; limit $10,000 per person per calendar year (the extra $5,000 via tax refund ended in 2025).
- No withdrawals in the first 12 months. Cash out before 5 years and you lose the last 3 months of interest; after 5 years, no penalty.
- Interest is federal-taxable only when you cash out and always exempt from state tax.
- EE bonds pay a low fixed rate but are guaranteed to double in 20 years (≈3.5%/yr) if held that long.
✓ Good for
- Emergency-fund overflow that should keep up with inflation
- Gifts to children (EE for far-off goals)
✕ Not for
- Money you might need within a year
- Amounts above $10,000 a year (see TIPS)
- Rates are announced each May 1 and November 1; the fixed part is set at purchase and never changes.
- Interest is credited on the 1st of the month: buy late in a month, redeem early in a month.
Do it in 3 steps
- Open a TreasuryDirect account → TreasuryDirect↗
- Buy I bonds (BuyDirect → Series I) → I bonds page↗
- Note the 12-month lock in your calendar → See the current rate
Go deeper — if you already know the basics
- Composite = fixed + 2×semiannual inflation + fixed×semiannual inflation. The fixed rate is the part worth chasing.
- Interest can be federal-tax-free when used for qualified tuition (income limits, IRS Form 8815).
- Gift-box purchases count toward the recipient's limit in the year delivered — a way to pre-buy.
How it works
- 5-, 10- and 30-year terms at auction or on the secondary market.
- You are guaranteed at least the original principal at maturity even if prices fall.
- The quoted "real yield" is your return above inflation if held to maturity.
✓ Good for
- Retirement money that must keep pace with prices
- Amounts too large for I bonds
✕ Not for
- Taxable accounts if you dislike paying tax on inflation adjustments you haven't received in cash
- Prices move daily; sell early and you can lose.
- In a taxable account the inflation adjustment is taxed yearly ("phantom income") — hold TIPS in an IRA, or use a TIPS fund that distributes it.
Do it in 2 steps
- Read the real yield curve → U.S. Treasury↗
- Buy at auction via TreasuryDirect or a brokerage → TIPS page↗
Go deeper — if you already know the basics
- Nominal 10-year minus TIPS 10-year = the market's inflation forecast ("breakeven").
- Short-term TIPS funds track inflation closely with little price risk; long TIPS swing like long bonds.
How it works
- Municipal bonds: from states and cities; interest usually free of federal tax (and state tax if it is your state).
- Corporate bonds: "investment grade" (solid companies) or "high yield / junk" (shaky ones paying much more).
- Bond funds & ETFs: hundreds of bonds in one share, no maturity date, value floats, income monthly.
- The rule everyone trips on: rates up → existing bond prices down, and vice versa. Hold to maturity and it doesn't matter; hold a fund and you feel it.
✓ Good for
- The steady half of a long-term portfolio
- Tax-free income for high earners (munis)
✕ Not for
- Picking individual corporate bonds yourself — a professional's job
- Chasing "high yield" without accepting that it is high risk
- Default rates on junk bonds average ~4% a year and spike above 10% in recessions.
- A bond fund's duration ≈ its % price drop per 1-point rise in yields. Duration 6 → ~6% drop.
- Munis: check call provisions and whether the bond is subject to AMT.
Do it in 3 steps
- Start with a total-bond-market index fund (compare costs) → FINRA Fund Analyzer↗
- Learn the basics in one page → Bogleheads wiki↗
- Research a specific muni → MSRB EMMA↗
Go deeper — if you already know the basics
- Ratings: AAA→BBB- investment grade; BB+ and below high yield.
- A bond fund held roughly as long as its duration returns about its starting yield — the most useful rule in fixed income.
- Ladders give certainty of principal per rung; funds give liquidity and automatic reinvestment. Neither is "better".
How it works
- You earn from price growth and from dividends (a share of profits paid to owners).
- Buy through any brokerage; a broad index fund holds hundreds or thousands of companies in one purchase.
- Inside a 401(k) or IRA, growth isn't taxed every year (see Retirement accounts).
✓ Good for
- Money you won't need for 10+ years
- Retirement savings
✕ Not for
- Emergency funds or anything needed within 5 years
- Anyone who will sell in a panic after a 30% drop
- Individual stocks can go to zero (Enron, Lehman, SVB). Keep any single name to a few percent.
- Trading frequently, options and leverage lose money for most people who try them.
- Practice with MoneyDesk's paper-trading portfolio first — notice how you feel when it drops 10%.
Do it in 3 steps
- Understand what you're buying → Investor.gov↗
- Practice with pretend money → Paper trading
- Then buy a broad index fund inside a retirement account → Funds & ETFs
Go deeper — if you already know the basics
- Dividends reinvested have been roughly a third of long-run returns.
- Valuation (P/E, CAPE) says little about next year and a lot about the next decade.
- International stocks are ~40% of the world; most professionals hold 20–40% of their stock slice abroad.
- Long-term gains and qualified dividends are taxed at 0/15/20%; short-term gains at ordinary rates.
How it works
- Instant diversification: one share owns a slice of every company in the index.
- Over 15 years about 90% of actively managed funds trail their index after fees — fees are the one thing you fully control.
- ETFs: no minimum, trade all day, slightly more tax-efficient. Mutual funds: sometimes $1,000–$3,000 minimums, automatic investing is easier.
✓ Good for
- Nearly everyone's long-term money
- The default inside a 401(k) (pick the target-date fund for your retirement year)
✕ Not for
- Money needed within 5 years
- Expense ratio: 0.03% on $10,000 is $3 a year; 1.00% is $100 — every year, up or down.
- Leveraged and inverse ETFs reset daily and decay — trading tools, not investments.
- Niche ETFs have wide bid–ask spreads; use limit orders.
Do it in 3 steps
- Compare any two funds' costs side by side → FINRA Fund Analyzer↗
- See how few active funds beat the index → S&P SPIVA↗
- Open a retirement account and buy a target-date or total-market fund → Retirement accounts
Go deeper — if you already know the basics
- ETF tax efficiency comes from in-kind creation/redemption; mutual funds can distribute capital gains in December.
- Ask for the cheapest share class you qualify for (Admiral/Institutional vs Investor).
- Tracking error and securities-lending income explain why two S&P 500 funds differ by hundredths.
How it works
- 401(k): through your employer, from your paycheck. Contribute at least enough to get the full match.
- Traditional IRA/401(k): tax break now, taxed when withdrawn. Roth: no break now, no tax later.
- What you buy inside is up to you — a target-date fund is a fine one-line answer.
- Order most planners agree on: match → high-interest debt → emergency fund → Roth IRA → rest of 401(k) → taxable brokerage.
✓ Good for
- Every long-term saver
- Anyone whose employer offers a match
✕ Not for
- Money you need before ~59½ (penalties apply, with exceptions)
- New in 2026: if you earned over $150,000 from the employer last year, catch-up contributions must be Roth.
- Old 401(k)s: roll over trustee-to-trustee to avoid withholding.
- An HSA (with a high-deductible health plan) is triple-tax-advantaged and can be invested — arguably the best account in the code.
Do it in 3 steps
- Find your plan's match rule (HR or the plan website) and contribute at least that → IRS limits↗
- Open a Roth IRA at a low-cost brokerage
- Pick the target-date fund for your retirement year → Funds & ETFs
Go deeper — if you already know the basics
- Backdoor Roth for incomes above the Roth limit; mega-backdoor where the plan allows after-tax contributions.
- Asset location: bonds and REITs in tax-deferred accounts, stock index funds in taxable/Roth.
- Roth conversions in low-income years (early retirement, sabbatical) can be worth six figures over a lifetime.
How it works
- Real estate: your home is a place to live that may appreciate; a rental is a part-time business with tenants and leverage.
- REITs: companies that own buildings and pay out most profits as dividends — real-estate exposure for one share; hold in an IRA (dividends taxed as ordinary income).
- Gold & commodities: no interest, no earnings; price is what the next buyer pays. A rough inflation hedge over decades, a wild ride in between.
- Crypto: extremely volatile, not insured, exchanges have failed (FTX 2022). Only money you can afford to lose entirely.
- Annuities: simple immediate annuities can make sense in retirement; complex variable/indexed ones often carry high fees and surrender charges.
✓ Good for
- REIT index fund: a 5–10% slice for diversification
- A simple income annuity for part of retirement spending
✕ Not for
- Your emergency fund or any money with a date
- "Guaranteed" high returns from anyone, anywhere
- If someone promises high returns with no risk, or pressures you to decide today: walk away.
- Gold ETFs are taxed as collectibles (28% max long-term); commodity ETFs suffer roll costs.
- Spot bitcoin ETFs remove custody risk, not price risk; position size is the decision.
Do it in 3 steps
- Check any adviser or product seller → FINRA BrokerCheck↗
- Read the SEC's crypto investor alerts → Investor.gov↗
- Annuity questions to ask → FINRA↗
Go deeper — if you already know the basics
- REITs are valued on FFO, not earnings, and behave partly like long bonds when rates move.
- Immediate-annuity pricing follows Treasury yields — ladder purchases over years.
- Private credit and "alternatives" sold to retail carry illiquidity and opaque marks; demand audited returns and exit terms.
- APY
- Annual percentage yield — what an account really pays over a year, compounding included. Compare APY to APY. more↗
- Yield
- Annual income as a percent of price. For a bond bought today, its yield to maturity is your return if you hold it to the end. more↗
- Expense ratio
- A fund's yearly fee as a percent of your money, taken automatically. The single most predictive number for a fund's future performance — lower is better. more↗
- Duration
- How much a bond or bond fund's price moves when rates move: duration 6 ≈ 6% drop for a 1-point rise. more↗
- Diversification
- Spreading money so no single company, sector or asset can sink you. Index funds do it in one purchase. more↗
- Liquidity
- How fast and cheaply you can turn something into cash. Savings: instant. CD: penalty. House: months. more↗
- Maturity
- The date a bond, CD or T-bill pays back its principal. more↗
- Index fund
- A fund that copies a list (S&P 500, total market) instead of paying managers to pick — cheapest way to own the market. more↗
- Roth
- Pay tax now, never again: qualified withdrawals in retirement are tax-free. more↗
- Dollar-cost averaging
- Investing a fixed amount on a schedule regardless of price — removes timing decisions and emotion. more↗
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