There are a lot of aspects of self-defense that don’t include shooting a firearm. Surviving an attack may lead to injuries (first aid training) or escaping (situational awareness training) or locking a location (locks or other ways to secure something closed).
Knots are incredibly useful in first aid, securing things closed, and for countless other applications. Knowing how to tie the appropriate knot can be life-saving.
Check out this fun website to help you learn how to tie the knot you need:
Which knots do you already know?
All photos from https://www.animatedknots.com/complete-knot-list