Sometimes when we learn, an experienced teacher lets us know something that sticks. Like how to do x, or how to try y. In leatherworking, have you been taught anything that immediately changed how you approached a technique, and has stuck with you ever since?
For me, it was having the proper board under punch tools when punching. Having a soft surface, like a cutting board or poundo board, absorbs the shock from hitting the punch, while also protecting the blades. Games changer, and I’ve done it ever since.