Nigel’s analysis of this instructive Capablanca endgame is included in the Tiger Chess Endgame Course. It also appears in Shereshevsky’s excellent book – Endgame Strategy.
Capablanca wrote “White’s plan is to prevent the advance of the c pawn (after which the b pawn could become weak) and to control the entire board up to the fifth rank. This is achieved by moving the King to e3, and by placing the rook at c3, the Knight at d4, and the pawns at b4 and f4. After he has attained such a position White will be able to advance his Q-side pawns.”