One of the tips I liked (I think this was from Aokrongly first, not sure), is that betting is the same as a conversation. What you're trying to do is interpret that conversation. A bet is "I really like my hand", a call is "I kind of like my hand or I think it can improve", a check is "I dont like my hand", stuff like that. Of course, just like any conversation, someone could be lieing...

The trick to hand reading is to take what message is in the betting (and you're looking at all streets, not just the current one) and think of which hands make sense and would fit into whats being said in the betting.