You have to be able to sit down at any money or free poker table, online or live and study your opponents. I really believe patience is the key ingredient when it comes to analyzing players and the most vital stage is when the game starts.
Why you might ask?
This provides you with you a chance to sit back and take mental notes on the player’s actions. This is extremely effective during the first 30 minutes of a free poker game in particular as many players like to go all in and hope they win the pot. I myself will only call these players with a high pair, or suited low connectors because I’ve played them before, and they will go all in with any two hand cards given.