Most money questions come down to three jobs: keeping cash safe until you need it, growing money you will not touch for years, and moving money across borders without losing a slice to fees. The guides in this section are grouped around those jobs, plus a fourth for readers outside the United States who want to own US stocks, ETFs or Treasury bills. Each guide answers one question in depth, shows the arithmetic, and links to the next thing you are likely to need.
Which guide should you read first?
Start with the date you will need the money, because that decides how much risk the money can carry. Cash for bills next month and savings for a house in two years need protection from losses. Retirement money for 2050 can ride out market drops.
| Your goal | When you need the money | Start with | Then read |
|---|---|---|---|
| Build or hold an emergency fund | Any time, at short notice | Where to keep an emergency fund | How much emergency fund you need |
| Earn more on idle cash | 1 to 12 months | Safe investments | T-bills vs high-yield savings |
| Lock in a Treasury rate | 4 weeks to 30 years | US Treasuries | How to buy Treasury bills |
| Save for a home in a few years | 1 to 5 years | Where to keep a down payment | CD ladders |
| Invest for retirement | 10 years or more | How to invest in stocks | Roth vs traditional IRA |
| Understand crypto before buying | Long term, high risk | Crypto investing for beginners | How to store crypto safely |
| Send money to family abroad | Days, sometimes minutes | How to send money internationally | Cheapest way to send money abroad |
| Buy US assets from another country | Long term | Invest in the US from abroad | Form W-8BEN explained |
Where can you keep cash safely and still earn interest?
Insured bank deposits and short-term US Treasury bills are the two main homes for cash that must not lose value. Bank deposits are covered by FDIC insurance up to $250,000 per depositor, per insured bank, per ownership category, and T-bills are backed by the US government, with a minimum purchase of $100, in $100 increments.
The safe investments hub lays out every option on one risk ladder, from checking accounts to CDs, money market funds and I bonds, with the protection, access rules and tax treatment of each. The Treasuries hub goes deeper on bills, notes, bonds and savings bonds, and its live T-bill rates page shows every bill term from the latest Treasury data.
Taxes change the comparison more than most people expect. Interest on Treasury bills is taxed by the federal government but not by states or cities, while bank interest is taxed by both. In a state with a 5% income tax, that difference alone is worth about a fifth of a percentage point on a 4% yield.
Worked example: $10,000 for three months: a T-bill or a savings account
On October 30, 2026, the 13-week Treasury bill traded at a 3.99% discount rate. A $10,000 bill bought at that rate would cost $10,000 × (1 − 0.0399 × 91 ÷ 360) = $9,899.14 and pay $10,000 at maturity, so it earns $100.86 in 91 days.
A savings account paying 4.00% APY earns about $10,000 × (1.04 raised to the power 91 ÷ 365, minus 1) = $98.26 over the same 91 days.
Before federal tax, the two are close. After a 5% state income tax, the savings interest drops to about $93.35, while the T-bill interest stays $100.86 because states cannot tax it.
This table recalculates the purchase from the most recent 13-week rate in the site's Treasury data feed; if the feed is unavailable, it uses an illustrative 4% rate and labels it that way.
| Step | Amount | How it is worked out |
|---|---|---|
| Face value | $10,000.00 | Paid back in full at maturity |
| Term | 13 weeks (91 days) | Bills are quoted on a 360-day year |
| Discount rate | 3.990% | the 13-week rate on Oct 30, 2026 |
| Purchase price | $9,899.14 | $10,000 × (1 − 3.990% × 91 ÷ 360) |
| Interest earned | $100.86 | Face value minus purchase price |
| Investment yield | 4.087% | Coupon-equivalent yield on a 365-day year |
The Treasury bill calculator runs this for any face value and term, and the compound interest calculator shows how savings grow when interest is reinvested.
How should you start investing for the long term?
For money you will not need for many years, most investors use a tax-advantaged account and low-cost, diversified funds rather than individual stock picks. The stocks hub walks through account types, index funds, costs, dividends and taxes in the order a first-time investor meets them.
Two numbers shape long-term results more than any single pick: what you pay in fund fees each year and how steadily you keep investing through downturns. The DCA calculator shows what regular monthly purchases of an asset such as the S&P 500 SPY ETF would have produced historically, including through drops.
Crypto sits at the far end of the risk scale. Prices can fall by more than half in a year, custody mistakes can be permanent, and the tax rules are their own subject. The crypto hub covers buying, storing and taxes through that risk lens, alongside live crypto prices. Readers who want the background on stocks vs coins can start with the crypto vs stocks comparison.
How do you send money abroad without overpaying?
The real cost of a transfer is the fee plus the gap between the exchange rate you get and the mid-market rate, so always compare the amount the recipient receives. A low or zero fee can hide a rate that is 2% or 3% worse than mid-market.
The World Bank tracks this across the world's largest corridors. In its Q3 2025 survey, sending $200 from the United States to Mexico cost 4.54% on average once fees and exchange-rate margins were added together, and sending $200 to India cost 3.68%. The money transfer hub explains how to read those benchmarks, which bank details each country uses, how instant payment systems work and which US rules protect you, including the 1% federal tax on cash-funded remittances that started in 2026.
The currency converter shows live mid-market rates, and the money transfer cost calculator compares quotes once you have them. For transfers from the UK to India, see the dedicated UK to India guide.
Investing in the US from another country?
Non-US residents can usually buy US stocks, ETFs and Treasury bills through an international broker, but three rules change the math: tax withheld on US dividends, US estate tax on US-held assets, and currency swings. The invest-from-abroad hub explains Form W-8BEN, the treaty withholding rate for each country, the estate-tax threshold and when Ireland-domiciled ETFs are worth comparing with US-listed ones.
How are these guides researched and kept up to date?
Each page is built from primary sources first: the agencies that write the rules and publish the data. Figures that change, such as rates, limits and tax thresholds, are stored once with the date they were checked, so every page that uses them updates together. Tables of rates and prices are rendered on the server from the latest data, and when a data source is unavailable the page says so instead of showing an old or estimated number.
Pages list their sources, show a last-reviewed date and are rechecked at least once a year, or sooner when a rule changes. The editorial policy explains how guides are researched, how product mentions are labeled and how to report an error.