It is completely up to you how many bets you need to make in a sports betting day, but if you know what you are doing and making money doing it, you should probably make as many bets as you can on what teams or player will win. If you ask a professional sports better, they would probably tell you that they take the bets that they have the biggest edges in and can make the most money. Personally, I prefer parlays, since you can make a number of bets and can win a lot for a small bet amount.