Please help me to learn what to do in this endgame!!

White to play and i don`t know what to do in this position. Maybe is something related to knowledge i am missing or specific strategy in this endgame. Please give me your advices or a book name that clarify this kind of positions. Thanks.

i would just consider h4, but the position looks very drawish. Neither white or black can really make use of these open files, cause these two good knights are blockading them.

Black could just try to sack one rook for the knigt and the pawn and then push his queenside majority, but as long as white can hold onto his a pawn, there shouldnt be a win.

Typically if the board is reduced to 4v3 king side pawns one rook each that is very hard to win.
In this position it is not on the king side that you progress but the queen side.
So for example: ... a5 ; Nxa5 (lemon) Rc2 (7th!) ; Nc4 Ra8, such a line gives black the advantage for chasing down the "a" and "b" pawns via the pesky pressure on the white f-pawn. 
I think black has just enough to win this.

The problem for you is black doesn't have any weaknesses you can hope to target later.

The general flow of the game will be your setting up some passive formation, and black trying to trade rook(s) and/or knight in a way that gives him a winning endgame. For example knight vs knight is probably winning but rook vs rook might be a draw.

So you'll put one or both rooks on the d file. One or both rooks on the 2nd rank, let your knight keep the c file closed, and just wait. You probably don't want to move your 'a' pawn right away because b3 can be pressured from a knight on c5.

h4 is probably ok, but you'll want to leave your f2 pawn where it is. Close to your king and on the 2nd rank keeps the base of your pawn chain about as defended as it can hope to be.

As for some of the suggestions for black, like pushing the a pawn (or h pawn) and sacing on c4, those are good ideas I think, and some of them might be winning right away (or soon), but my general impression is the rooks can be improved... and if it's true white can't do anything, then first you should maneuver around some, and only after a while (hopefully after improvement has happened) will you go for something you can't take back like a pawn move or sacrifice.

H5 for black was a mistake, g5 would have been much stronger.

Blacks best winning plan is to break through on the kingside/center.

Yeah, I think so.

An early a4 by black may be good (?) but in general reducing that side to just 1 pawn brings white closer to getting a draw.

h4? is wasting a tempo where you dont get any advantage by moving it and there is no threat from h5.

When accessing the stable position without tactical possibility, you need to check

1. where can I attack vs

2. what is my weakness,

Which one is more important.

Clearly there is no option 1.

But there is option 2. You have serious weakness on a3, which can be attacked by Kt via Nc3 outpost which will subsequently lead to significant restriction on black rook's movement.

Plan?

If white can exchange 1.a3 a5 2. axb3 axb3 or

1. a3 bxa3 2. Ra1  .... then Rxa3 will solve your weakness in queenside.

If white can exchange those two pawns, it is a well known drawish rook endgame. Without solving your urgent issuse, you have high risk of losing in current position.

When  your rooks are restricted, black can easily push his passed pawns by doubling rook on " e" file and subsequently play ,

f6,e5, f5,e4 etc . It could be a draw or forced loss.

Those plans are quite impossible when you can get rid of black' kt outpost.

Ce6 win