If you are wondering how to beat people at poker, one way that doesn't take a lot of effort is to change the way you play. I write about this in my book here.
http://pokerdaemon.blogspot.com/2014/06/superior-texas-hold.html
So if you are playing a player that you think plays a certain way, then look up how to play against that person and use that strategy. It's that easy, pretend you are acting and assume the role. Fish against a shark. Act like a landmine against a Maniac. And so on....
Play that session like you looked at the game differently.