https://banjobenclark.com/lessons/guitar-harmonics-how-and-why-guitar-beginner
Guitar harmonics are fascinating! I remember the first time I heard them, and wasn’t long before I was working them into my songs. This lesson gives an overview for how harmonics happen and how to use them.
Many moons ago I loved playing Cajita de música by Isaias Savio which uses 'em well. Harmonics are fun!!