That is significantly more complicated than how I was taught to sew in a button. Is this just for big metal buttons on jeans or something? It seems massively over the top for normal shirt buttons, which come off fairly regularly.
Roughly what I was taught (for a 4 hole button, in a “cross” shape):
- Shove threaded needle through material into hole in button
- Go across diagonally and go down through the opposite hole and through the material
- Under the material, go across sideways a bit and come up in a different hole
- Repeat 1-3 a bunch of times until it feels strong enough.
- Tie off the thread and cut off the excess.
Yeah, it totally makes sense for some uses.