If you don't understand esports or game that you have been gambling on (Dota, CS:GO...), you will not earn any money. In that case it's much harder to bet on then regular sports like football etc...
It for sure we don't know anything if we never have some involvement. e-sports and any gambling sport aren't hard to learn if we are motivated to do so or we are really want to engage in those games. We can't just learn through reading but we can make it pretty easy through the actual event.