While there's no limit in betting sports even if you know nothing about that certain sport, but it gives you more advantages if you decide to bet only on sports that you are highly knowledgeable of. Aside that it will reduce emotional bias since you are betting not based on your emotions, it will also give you informed decisions so you can understand better by knowing the personal background of the game, the players performance and its historical trends and patterns. With that, you are increasing your chances of winning with your smart decision making and profitable decisions.