Learn Sports Betting Fundamentals

This is the “read this once and stop betting like a rookie” page. No sales pitch. Just the concepts you actually need to understand.

Moneylines

Who wins the game, nothing else

  • -150: Bet $150 to win $100. Favorite.
  • +150: Bet $100 to win $150. Underdog.
  • Implied probability: prob = risk / (risk + win).

Example: -150 favorite = book saying they should win ~60% of the time.

Point spreads

How books balance mismatches

  • -3.5: Favorite must win by 4+ points to cash.
  • +3.5: Underdog can lose by 3 or less and still cash.
  • Most spreads are priced around -110 each side.

Example: -3.5 at -110 = risk $110 to win $100 on a 4+ point win.

Totals (over/under)

Betting on combined points

  • Book sets a line: e.g. 47.5 total points.
  • You bet over or under that number.
  • Usually -110 each side unless something is weird.

Example: Over 47.5 in an NFL game — you want fireworks, not punts.

Parlays

Multiple bets, one big payout

  • Every leg must win or the whole thing dies.
  • Payout multiplies the odds of each leg.
  • Books love parlays because your edge shrinks fast.

Example: 3 legs at -110 each ≈ +596 payout, ~14–15% to actually hit.

Bankroll strategy

How not to blow up

  • Decide a set bankroll: money you can actually lose.
  • Bet 0.5–2% of that per play.
  • Use units instead of dollar amounts.

Example: $2,000 roll = $20 "unit". Most bets = 1 unit. Strongest conviction = 2 units.

Closing line value

The sharpness scoreboard

  • If you bet -2.5 and it closes -4, you beat the market. Good sign.
  • If you bet -2.5 and it closes -1, you probably misread it.
  • Long-term, beating the closing line is more important than wins.

Example: Pros obsess over closing line; recs obsess over yesterday's parlay.