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EDUCATION

Understand the decisions behind every calculator.

Plain-language explainers on the career and money topics this site's tools touch: what a number means, why it works the way it does, and what to actually do with it. General information, not personalized advice.

This section is just getting started. Nine articles are live below; the rest are planned next, matched to the calculators already on the site. Check back for more, or use the Tools menu above for what's live today.
Available now
Credit card or debit card: what's actually different?
Whose money you're spending, how each protects you from fraud, and why only one of them builds credit.
How do credit card companies actually make money?
Interest, interchange, and fees: where issuer revenue actually comes from, and who ends up paying for your rewards.
How does interest actually work?
Simple versus compound, why the rate and the schedule both matter, and the same math working against you in debt.
How do taxes actually work?
Tax brackets, marginal versus effective rate, and the different kinds of taxes that come out of your paycheck, purchases, and property.
How do credit scores actually work?
What goes into the number, what moves it fastest, and which common advice is outdated or wrong.
How do different asset classes actually work?
Stocks, bonds, cash, real estate, gold, and crypto: what you actually own with each one, and how much risk it carries.
How does buying a car actually work?
Financing, depreciation, leasing, and negotiating: what actually moves the real cost beyond the sticker price.
How does your paycheck actually work?
What federal, state, and FICA withholding actually are, and why your take-home pay is lower than your salary.
What is inflation, and how does it actually work?
What CPI actually measures, why prices don't all rise at the same rate, and the difference between nominal and real value.
Planned topics
COMING SOON
Building your first budget
Why the 50/30/20 split exists, when it doesn't fit your situation, and how to adjust it without guessing.
COMING SOON
Student loans and payoff strategy
Federal vs. private loans, how interest actually accrues, and how avalanche and snowball compare in practice.
COMING SOON
Renting vs. buying: the basics
What price-to-rent ratio means, what a down payment actually protects you from, and when renting is the better call.
COMING SOON
Getting started with retirement savings
Why starting early matters more than starting big, and the difference between the account types you'll hear about.
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