The "standard" strategy is to play GTO (game theory optimal). There are solvers out there (like GTO Wizard) that show you the "optimal" play for every situation, which is used as a baseline, and then players deviate to exploit specific player tendencies.

GTO trees are far too complex to fully memorize, so nobody can play perfect GTO. But you can do a lot of solver work to get reasonably close.

Super System is old, but I wouldn't call it outdated. Definitely still worth a read. The more books you've read, the bigger your tool set. The key here is that it works in both directions because each style you learn, is a style you may recognize other players using. The pitfall of Super System, is by now, everyone's read it, and it's quite easily recognized:

- limp-shoving under the gun

- always trying to go on runs

- over playing suited connectors (JTs specifically)

But, you still get the advantage of being able to recognize it. There's lots of good wisdom in there that isn't as prescriptive either. Read as many books as you can. Poker is information warfare.

No idea, obviously you can see I'm a n00b and not a profitable poker player but on the strategy side, and this is very oversimplified, but you should be folding a lot of the time other than when you get AA-22, AK, AQ, AJ, AT, KQ, KJ, QJ, JTs, T9s, 87s you call or 3 bet pre-flop because you have good odds. When you're up against tight players you can make a small bluff on the flop and scare them away most of the time, if they raise you fold though. Position is very important in the game, when you're on the button you have odds in your favor because everyone else has to check or bet before you so you play more loose and aggressive in that position and more tight and passive in early position. There is no one single strategy to memorize and apply, that's why it's great. 5 minutes to learn the game, a lifetime to master.