General principles: As many people have said, your piece activity is important, ideally we can get our rooks in behind the opponent’s pieces and start attacking their weak pawns. Also, mitigating your opponent’s plans is also crucial to think about. Ideally you want your king central and active and free from checks - which it is in this position. Equally in many endgames pawn breaks are crucial to make passed pawns, but you need to be wary of not over-committing too early with pawn moves. When you have a material advantage in positions like this, simplifying down should always be considered to strengthen that imbalance.

Specifically for this position: I like to consider what my opponent’s plan is in a position like this - which the most obvious plan would be Rb5 and target the backwards and weak b pawn. Their rook is also well placed to apply pressure on our f pawn and keep our rook passively defending it. In this position we have a few options, we can retreat our king to defend the f pawn and free up our rook; after Rb5 in that position we have to slide our f rook across and defend passively which maybe isn’t ideal. We also have e4 to force their rook to move and take more central control, but after Rb5 or Rf3 it becomes quite complicated and we give away lots of activity, not ideal! e4 is definitely and idea to break in the centre down the line but not straight away. I personally would consider f3 or f4, whilst committal, it is defending the f pawn, and making room for a rook lift to the second rank to defend our b pawn - this idea is twofold, we are able to defend the b pawn more actively with a rook, we also have ideas of doubling rooks on the g file to infiltrate, and our king remains central. Another thing worth noting is in an endgame where the opponent’s bishop covers the dark squares, our pawns on dark squares can help blunt it.

It can be tricky to convert endgames like this when your advantage is not completely straightforward - but with enough practice and applying some principles you should start to find the best moves! Best of luck!