Interest the rent on borrowed money: balance × the monthly rate, every month. Where it's taught Loans & Amortization Try it with a calculator Loan Amortization Calculator Appears in 58 other lessons Compound Interest & the Time Value of MoneyThe Rule of 72: How Fast Does Money Double?Present Value: Should You Take the Lump Sum or the Payments?The Cost of Waiting: Why a Late Start Costs More Than the Years You SkipWhat Is Money & InflationPaycheck Withholding & the Tax-Refund MythWhich Dollar Is Worth Most: A Raise, a Side Hustle, or Cutting Costs?Gig Work & 1099s: The Self-Employment Tax SurpriseThe Cost of Never Negotiating: A Small Raise, Compounded Over a CareerBudgeting & Cash FlowThe Emergency FundOpportunity Cost & Trade-OffsNet Worth & the Order of Operations: Where Every Dollar Goes FirstCredit Cards & the Minimum-Payment TrapInterest, APR & APYDebt Payoff Strategies: Avalanche vs SnowballCredit Scores: What Actually Moves the NumberGood Debt vs Bad Debt: It's Not the Loan, It's What You BoughtEmergency Fund or Pay Off Debt First?Buy Now, Pay Later — or Save Up First? The True Cost of Financing a PurchaseDebt Consolidation: Does Trading Several Debts for One Actually Help?Balance Transfer: The 0%-APR Card That Becomes a Trap If You Miss the DeadlinePayday Loans: What a 'Small' Two-Week Fee Actually CostsBorrowing From Your Own 401(k): The Loan That Sounds FreeCo-Signing a Loan: Vouching for Someone Else's DebtBank Accounts: Where Your Cash Should Actually SitSinking Funds: Saving Monthly for the Bill You Know Is ComingReal Returns: What Your Money Is Actually EarningYou Just Got a Windfall: Where Should It Go?Dollar-Cost Averaging: Investing Through the Ups and DownsWhy a 50% Loss Needs a 100% Gain: Volatility DragIndex Funds, ETFs & the Quiet Cost of FeesStocks: Price, Dividends & What 'Total Return' Really MeansBonds: Why Their Prices Move BackwardsRetirement Accounts & the Employer Match: The Closest Thing to Free MoneyThe HSA: The Only Account With a Triple Tax AdvantageTax Brackets: Your Bracket Is Not Your Tax RateHow Much House Can You Actually Afford? The 28/36 RuleRent vs Buy: It's a Break-Even, Not a BattleInsurance: Buy Term and Invest the DifferenceMortgage Points: Buying Down Your Rate Is a Break-EvenAdjustable-Rate Mortgages: The Teaser That ResetsRefinancing a Loan: When Does It Actually Pay Off?HELOC: Borrowing Against Your HomeCoast FIRE: The Age You Can Stop Saving and Still Retire On TimePaying for College: 529 Savings vs the Cost of Student DebtStudent Loans: Standard vs Income-Driven Repayment (and Forgiveness)Pay Down Debt or Invest? The Guaranteed-Return CrossoverBuying a Car: New vs Used vs LeaseReal-Estate Investing: Cap Rate, Cash Flow, and the Magic (and Menace) of LeverageOptions: Calls, Puts, and the Hockey-Stick PayoffTax-Loss Harvesting: Turning a Loser Into a Tax BreakAnnuities: Buying Yourself a Paycheck for LifeForeign Exchange: What a Currency Really Costs to SwapBehavioral Finance: Why We Sell at the BottomScams & Fraud: Spotting a Too-Good-to-Be-True ReturnFees Everywhere: The Costs That StackCapital Gains: Why Holding On (and Trading Less) Beats the Tax Related terms AmortizationExtra principal paymentPrincipalTerm