First notes. What I've found useful lately is including timing tells in my notes.

"Snap call cbet on A74r flop with TT"
"Insta-bet river with missed draw"

Stuff like that. Noting how they play draws can be useful, I made a lot of money off one reg once I got notes that he always b/3b any draw for instance. Whether they'll cbet a multiway pot if they miss.

I'll use stats to help decide what to do on the flop based on their stats on the turn. Its a money sink to float flop with A high if villain cbets turn over 70% for instance, but if they cbet turn 25% you can take it away on turn a lot. How often they raise flop is another. If I have a decent draw I'd prefer not to be pushed off, then I check that stat, if they only raise 8% or so, then I confidently bet my draw and wont be too unhappy folding if they raise, but if they raise flop a lot I might prefer to take a free card (or c/c OOP).

Real reads matter most of course, but thats mainly what I use stats for, planning ahead and anticipating the future.