Isolated Endgame Doubled/Tripled Pawns
Isolated doubled and tripled pawns can be assets in the endgame, because of how we can use a "snail" technique. I'll show you what I mean.
Here's what to do for tripled pawns: Advance them one at a time, keeping them all next to each other. No having one ahead of another for a while: Try to maintain JUST a line.
What about doubles?
Wow! You can promote ALL the pawns - just don't cause stalemate when doing so.