Chess Endgames

 Free Endgame Lessons

I have personally Come around to finding that Chessables Spaced Repetition Training (MoveTrainer) works incredibly well at learning Endgames. 

If you have not tried it, below are a list of Free Endgame courses there. 

FREE Chessable Courses

Basic Endgames - 181 Endgames (Very Nice in-depth Instruction) (This course was made by a chess-coach for his students and put up here for FREE)
(This alone is worth trying it)

Endgame Bootcamp with John Bartholomew - Learn the Basics
(Learn 10 Basic pawn , and Rook&Pawn Endgames) 

Essential endings: Mating with B+N - Learn this Endgame
Essential Endings: Playing R+B vs. R - Key Strategy's
Essential R+P vs. R Endings - IM John Bartholomew
Winning Chess Endings: Free Lesson - Some techniques by GM Yasser Seirwain
Johan Hellsten: Free Endgame Lesson - Endgame Techniques (10 Lessons)
Magnus Carlsen: Free Endgame Lesson - Lessons from his Endgames

Added this list to the  Chess Endgames Video Lessons Page