Wager

The amount of money a bettor risks on a single wager. Proper stake sizing is a critical component of bankroll management. Most professional bettors recommend risking between 1% and 5% of your total bankroll on any single bet to minimize the risk of ruin.

The commission or fee built into the odds by the bookmaker. Also known as vigorish (vig), it represents the bookmaker's profit margin. For example, if both sides of a coin flip are priced at 1.91 instead of 2.00, the difference is the juice. Lower juice means better value for bettors.

The total amount of money a bettor has set aside specifically for placing bets. Effective bankroll management is considered one of the most important aspects of long-term betting success, as it helps bettors survive losing streaks and avoid going broke.

A recreational or casual bettor who tends to bet based on gut feelings, popular opinion, or fan loyalty rather than statistical analysis. Squares typically bet favorites and overs, and their action is welcomed by bookmakers. The opposite of a sharp bettor.

A single bet that combines multiple selections into one wager. All selections must win for the bet to pay out. The odds multiply together, creating potentially large returns from small stakes, but the risk increases with each added selection.

A numerical representation of the likelihood of an outcome and the potential return on a bet. Odds can be displayed in decimal (2.50), fractional (3/2), or American (+150) format. Higher odds indicate a less likely outcome but a larger potential payout.