Advice please

Hello
So i recently made an account here and i hit around 2300. The thing i havent really had any training and i only used to really play few years a go. Now i want to take the game seriously and really imrpvoe but i dont know how. Most the resources online are for lower rated players but the resources for players around my rating seem to assume a lot of more classical chess knowledge that i dont have. Any advice or books?

Learn from the Legends by Mihail Marin
Mark Dvoretsky; Pervakov, Oleg (2009). Studies for Practical Players.
Grandmaster Preparation series by Jacob Aagaard

Start with the endgame.
Kasparov has recommended "Dvoretzky's Endgame Manual" for amateurs and professionals alike.

Hey!
You played just 56 games here - and you hit 2300 after 46 games in bullet.
This amount of games in one year? Most people manage that in 1-2 days :)
Anyway, it is hard to judge about your real level based on that.
You can go watch some high-rated streamers here, it is absolutely free!
Pick ones who play blitz/rapid and explain a lot the middlegame/endgame.
Books are overrated :)

2300 in a year!

you only started playing chess and went straight to 2300?
idk fake it looks rick

Bakuboku...!!!!

Yes . . . . .

Ok, Kasparov`s books are the creme de la creme, and they are mostly available online now. Study world champions, can be good.

As soon as you are up to it, dive into AlphaZero`s games. There's a lot there.

Then play the computer on hardest setting . . This seems dry and dull perhaps, and "frustrating"- but it's a perfect training partner . . . I.e., there's no ego or bad feelings etc ,.... Just chess.

And study tactics. . . Always this my friend.

Chess, 5334 Problems etc by Lazlo Polgar is good (mostly mates),

Encyclopedia of Chess Combinations is good.

And chess tempo.com and puzzle rush on chess.com are good.

Then also, world champions Smyslov and Botvinnik have books on their games, as do others....
I would say Alekhine and stuff but it's a bit old....
In truth I get more from Nimzovitch ....

Fischer, Carlsen etc.... And in general, always come back to, and mix in study of AZero .... It is not really possibly to describe how beneficial it is to study those.... So yeah definitely.

Hope this is of some help...