Rook against pawns

To put "rooks behind passed pawns" is not always good advice but very often and therefore it's a good endgame guideline. Particularly so, when things get complicated.

Chess: Is it better to have two rooks or the queen and why? - Quora

Chess pieces king queen bishop knight rook pawn Vector Image

Material Imbalance – Rook and Pawn vs Bishop and Knight - Remote Chess Academy

Starting Out: Pawn Endgames – Everyman Chess

Knight and 2 pawns versus a rook in the endgame

Chess Rules – Chess House

Puzzle Academy Content Update 3, including two complete endgames

Rook and 2 Pawns vs Rook - Master your chess with Coach B.

2 Rooks & 7 Pawns vs 1 Queen, 1 Knight & 2 Pawns - Battles - Comic Vine

ChessFeels #44: Material Imbalance and the Initiative