If you are placing bets on anything then you should try to minimise your risk. This means that you should try to think carefully about the bet you are placing and make sure that it is a sensible one. If you are betting for fun then this is a different matter, but if you seriously want to win then think it through.
Firstly choose a sport that you are very familiar with. For example, if you know a lot about baseball then choose this sport as you are likely to know about the teams and who is likely to win a game etc. Then make sure you choose a betting site with a good deal. You are likely to find that online betting sites are really good because they give you free bets and this could really help you to gain financially. It is also important to look at the odds and think about the games that you are actually betting on. Think carefully about who you think might win and also think about whether it will be better just to bet on who wins or to take a chance and bet on the possible score or which players make the most runs or whatever.
Some websites may not give you this sort of flexibility when betting but it is something to consider when choosing a betting site if this is the way that you want to bet. There are a lot of things to think about and if you do want to limit the risk that you are taking then it is worth thinking hard, getting a strategy together and very carefully placing bets, only when you are happy and you have really weighed up the odds and therefore the chances of you winning. It may seem like a lot of hassle but it is worth it when you start winning a good deal of money.