But can we play these tournaments on Steam Games? or we need to join somewhere else for earning with these games?
I recently got a free Steam Account which already have CS:GO game.. now after reading that I would definately search about how to earn with playing Games.
I believe it would be better if you look at forums like reddit. There are tons of people addicted in CS:GO there. You can earn not only in CS:GO, I guess you can earn money from other online games as well. There are various of things you can do: (a.) Sell your account (b.) Sell your items (c.) Do some boosting offers. (d.) Betting on tournaments/battles (e.) Joining tournaments/battles. But anyway, now that you mentioned you are going to do some research, you might as well want to understand the whole thing. It's pretty easy to understand.