If you seek to be a great Poker player then the best thing to learn is how to read your opponents to guess the hand they may have. This will give you an enormous advantage over other players. Remember though that just as you are trying to read them they will be attempting to do exactly the same with you. If you have a logical mind then you will be able to read your opponent at every round. You will learn their responses before and after they decide to raise, fold or call.
It is good advice to scrutinize the way your opposing players are playing. You will soon realise if they are playing safe or aggressively and you will notice their preferences for certain types of cards. Aggressive players are sometimes harder to read as you can never be quite sure they will do what you think they will do. Passive players can sometimes have an excellent hand and you will not realise it.
Bluffing is part of revealing other Poker players and some players are very good at it. If a player raises you then you should remember the hand they raised and their position.
There are plenty of things you can try to reveal your Poker opponents intentions and you will improve on this technique the more you play. The more you know about your fellow players the easier it will be to beat them at Poker and this is the best tip for all players. If your Poker opponents are revealed then your game becomes less difficult.