Poker is not really that difficult of a game when you really break it down. This is especially the case at the micro stakes which have some of the worst players in the world.
So it is always a bit surprising to me why so many people have trouble beating even the very lowest limits online. By this I mean stakes like NL2, NL5 and NL10.
By the time you graduate from these limits you should be able to build up a 1k bankroll. This is a huge and important milestone that allows you to comfortably move up to higher stakes and start making some real money in this game.