It's pretty rare that you'll need to use it, however in case you'd still like to learn it there are a few resources that can help.
This is the Lesson: https://www.chess.com/lessons/endings-openings-a-taste-of-the-middle/basic-mate-king-bishop-and-knight-vs-king
This is a classy video by Danny (13 years ago) in case you fancy the classics: https://www.youtube.com/watch?v=ur3mVl0bdog
Let me know if these are useful.
I need a non- confusing video that makes sence.