Use credit deliberately — scores, interest math, and the difference between tool-debt and trap-debt.
Credit is renting money. Rented well, it's a tool: a mortgage buys a home decades before cash could; a credit card, paid in full monthly, builds the score cheap housing and loans later require. Rented badly, it's a trap: carry a card balance at ~24% APR and the minimum payment barely dents the principal — a $2,000 balance at minimums can take a decade-plus and cost thousands extra.
Your credit score (~300–850) is your rented-money résumé: payment history and utilization dominate it. The playbook is short: pay every bill on time, every time; keep balances small relative to limits; start building history early with a card you treat like a debit card. And sort every borrowing decision into tool vs trap BEFORE signing: does this debt buy an appreciating asset or capability — or does it finance a want that will be gone before the payments are?
Mastery looks like: They compute carried-interest costs, explain the score levers, and sort debts tool-vs-trap with reasons.
Common stumbles: Fearing all credit (no history = expensive later); or normalizing balances because "everyone carries one."