Investing5 min read
Compound Interest, Explained Simply (And Why Starting Early Wins)
Two people save $200 a month. One starts at 25, the other at 35, and ends up with less than half as much. Here is exactly why — with every number shown.
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Personal finance, explained from the ground up
Fourteen topics, in the order they tend to matter. Every guide states its assumptions, shows the arithmetic, and links to a calculator so you can run it on your own numbers.
Suggested order
If you are starting from zero
You do not have to read in this order — but this is the sequence in which each idea makes the next one easier.
- Step 01
Control cash flow
A budget and an emergency fund decide whether everything else is even possible.
- Step 02
Fix the cost of borrowing
Credit scores and interest rates quietly set the price of the next ten years.
- Step 03
Put money to work
Investing and retirement accounts are where time does the heavy lifting.
- Step 04
Protect what you build
Insurance, taxes and scam awareness keep progress from leaking away.
All topics
Browse every topic
Budgeting
Give every dollar a job before the month starts.
ExploreSaving
Build the cushion that keeps a bad week from becoming a bad year.
ExploreCredit
How credit scores are actually calculated — and what moves them.
ExploreInvesting
The long-run mechanics: ownership, diversification, costs and time.
ExploreRetirement
Accounts, contributions, and what your future spending implies today.
ExploreTaxes
Brackets, deductions and withholding, in plain English.
ExploreBanking
What a bank actually does with your money — and what protects it.
ExploreLoans
Interest, amortization, and the true cost of borrowing.
ExploreMortgages & Real Estate
The biggest loan most people ever take, explained step by step.
ExploreInsurance
Paying a little, predictably, to avoid a lot, unpredictably.
ExploreEconomics
Inflation, interest rates and the forces behind the headlines.
ExploreBusiness Basics
Revenue, costs, margin and cash flow for non-accountants.
ExploreFinancial Independence
What the numbers say about savings rate, time and freedom.
ExploreFinancial Scams
How common money scams work, and the patterns that give them away.
ExploreGuides
Latest guides
Credit4 min read
How Credit Scores Actually Work
What a credit score measures, the five things that move it, and why the same balance can help or hurt depending on the day it is reported.
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Saving4 min read
How Big Should Your Emergency Fund Be?
Three to six months of expenses is the usual answer. Here is where that number comes from, when it is wrong, and how to size a fund around your actual essentials.
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Budgeting3 min read
The 50/30/20 Budget, Explained (And When It Does Not Fit)
A simple way to split take-home pay into needs, wants and saving — what each bucket includes, why the percentages are a reference and not a rule, and what to do when housing eats the budget.
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Investing3 min read
Index Funds, ETFs, and Why Fees Matter So Much
What a fund actually is, how index funds and ETFs differ, and the arithmetic that turns a 1% annual fee into a quarter of your final balance.
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Taxes3 min read
Tax Brackets Explained: Marginal vs Effective Rates
Why a raise into a higher bracket never leaves you with less money, what your effective rate really is, and the difference between a deduction and a credit.
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Every topic has a tool behind it
Reading explains the mechanism. A calculator shows what it means for your numbers.