Everyone of those categories are billion dollar a year industries and that is why they are the best ones to tap into
. I know you are probably thinking that there is way too much competition and you won't be able to make a lot of money. But the truth is, if you want to make a lot of money, you will have to get in the niches that have a lot of competition. And truth be told, there is plenty of room for all of us. The world is a big place so never run away from competition. After all, a niche or industry with very little competition is probably one with very little earning potential.