Chess endgame training
Chess endgames: king and pawn, opposition, rooks, king activity, and conversion technique.
Endgames reward precise knowledge: the pawn square, opposition, Lucena, bad bishops, and king activity. That knowledge turns drawish games.
Learn king and pawn first. Weakness there leaks easy points in blitz and rapid. Then rook and pawn, then queen versus pawn.
Endgame technique is more forcing than middlegame play. One slip ruins stalemate or a key square.
GChess library endgame books and basic mate drills are the practical path.