Well, here is a quick tip on notes: one thing you'd really like to know is how the opponent plays a flopped monster, like a set, top two, or a straight. Generally speaking, they will always do the same thing. That is a good note to take on everyone. The other thing you want to know is how do they play a big draw (OESD or flush draw) on the flop. Quite often you will find somone who will always slowplay a flopped monster, but always raise big draws. I try to take notes on these things, but otherwise I only make notes if they do something "out of line" with the stereotype that their stats suggest.

That would be my beginning advice on notes: how do they play 2pr or a set or bigger, and how do they play a big draw?

Recently I was in a hand where my note said "Pumps draws on flop, slowplays top2+ until turn". I made a flush on the turn and this guy raised me on the river when the board paired. Well, he had raised flop, so I *knew* he could not have a set and thus could not have just filled up. I 3-bet the river confidently with my flush even though the board was paired. He had the trips, but no full house, as expected. This kind of note will also keep you from giving free cards. When I have an opponent who always slowplays monsters and always raises draws (this is an amazingly common and easily exploitable pattern), when I have a decent-but-not-great hand like top pair, top kicker, I can 3-bet the flop and lead the turn and know that I'm probably up against just a draw so there is no risk of a turn raise. When they raise the flop, but just call the flop 3-bet and turn lead, then you know they are probably drawing, so you can check-call if the draw comes in on the river and save yourself from being raised. In fact, on this sequence and with this note, if my opponent is very aggressive, I will almost always check the river, because they will bluff their busted draw and I get an extra bet (they would fold the busted draw if I bet the river).

Maybe that's too much detail, but notes are helpful.

Jim