Quote Originally Posted by philly and the phanatics
Quote Originally Posted by Gobbatino
On the internet we have a few different ways of reading opponents, which is stuff you want to take notes on.

1. Categorize them on what type of player they are. (i.e. reg, noobie, nit, shark, casual player, speculative, etc)
2. General tendencies of player. (loose, aggressive, tight, etc)
3. What level they think on. (i.e. it's useless to try to manipulate what he might be thinking you might be thinking if he never tries to figure out what you are thinking, that is he is on level 0)
4. Specific reads you pick up from the way they play hands. (i.e. He checked a made flush on the turn OOP, played a OESD aggressively on the flop, etc)

p.s. This is mostly from The Poker Mindset, I highly recommend this book, it is pure win.
watch spendas 4 tabling 5nl video, he does a great job of emphasizing notes and showing how to use them to your advantage
Link?