My opinion only: I'd suggest starting with a thin book over basic endings. Averbakh has one but there are many others.
Beyond that the issue is 1. study an ending and 2. you want that study to 'stick'.
For me what works is, after I play and ending to study endings of that sort so it connects to what I've just seen. For example, I am now studying rook+2p vs rook + 1p since I just misplayed one. before that 2R vs Q endings.
(Some people can take a comprehensive book, start on page 1 and work thru it then they know it. I cannot.)
I most recently entered the intermediate range and realized a big flaw in my play. Most games at this level tend to go into drawish endgames more often where I am very bad. I was wondering if somebody knows any website/videos/books that could help me improve my chess endgames.
Thanks