If you understand opposite bishops are drawish, then when you have an advantage be sure to keep that in mind and not trade into a drawn ending.
Also, if you or your opponent chooses to go to sleep in any ending just assuming the draw will play itself, it's a great way to lose against a knowledgeable player who keeps on playing.
I should get to it about mid August.

Do you know what I hate? Opposite color bishop endgames. It's annoying how someone can play worse during the actual game, and be pawns down in the endgame, but just by virtue of there being opposite bishops they can draw.
Most of the time they don't plan it that way either.
There should be a rule in chess where if there are only opposite color bishops and pawns left, the person with the most pawns automatically wins.