For American odds format, you'll see the odds of any contest shown like so:
Team 1: +135
Team 2: -150
What this means is that if you bet on Team 1, you have the chance to score $135 in winnings for every $100 you bet. On the other hand, if you put your money down on Team 2, you'll only collect $100 in winnings for each $150 that you risk. The side with the “+” next to it is the underdog while the team with the “-” is the favorite. There are other odds formats, like Decimal and Fractional, but we recommend that you view the odds in American format. You can change the style of displaying the odds at any of the best sportsbooks for USA users.