This section explains how sports betting works, from reading a line to building parlays and teasers, with guides to specific sports. It is written for bettors who want to understand what they are betting on and what each bet type costs them.
Legal sports betting has spread quickly since the Supreme Court struck down the federal ban in 2018. Sports betting is now legal in 39 states plus Washington, D.C., and most of those states allow betting online as well as in person. Missouri was the most recent state to launch, on December 1, 2025. Offshore sportsbooks also take bets from US players, but they are not licensed by any US state regulator, and some states have ordered them to stop.
The pages below cover football betting, parlays and teasers, and auto racing. The rules of each bet are the same whether you place it at a casino window or on an app, so start with the bet type you use most.
Sports betting guides
- Football betting: point spreads, totals, moneylines and props for NFL and college games.
- Parlays and teasers: how multi-leg bets pay, how teasers move the line and when each makes sense.
- Auto racing betting: betting on NASCAR, Formula 1, IndyCar and other series: outrights, matchups and props.
Related
- US online sportsbooks: offshore sportsbooks that accept US players, and how they differ from state-licensed books.
- Las Vegas sportsbooks: places to bet in person in Las Vegas.
- Las Vegas scams: including touts who sell guaranteed picks.
Gamble for fun and set a budget before you play. If gambling stops being fun, the National Problem Gambling Helpline is 1-800-MY-RESET (call or text).