ANY TITLED PLAYERS TYPE ENDGAME TIPS AND ONLY TITLED PLAYERS!!!!
In all seriousness Malmsbury is right. Also learning to know when trading is beneficial to you. Even if you may not gain a material advantage, sometimes trading will take away a good position your opponent had and make use of a piece which may not have been useful.
Not titled, but seeing as my rating is about 400 points higher, I will add my input anyways. Most endgames that are winning for either player are typically only winning if they make one very specific move or series of moves. Not following this move will most of the time end in a draw. But other than that, learning the art of Zugzwang is important for endgames in chess. Most king and pawn endgames require learning it entirely.