I’ll make this brief…nothing good happens on the ground! In a self-defense situation, you want to stay on your feet at all costs. Being upright gives you more options, more mobility and more chances of surviving.
Yes, I know, there are specifics arts that actually go to the ground to fight (BJJ, Judo, Wrestling, etc.) and some these are fantastic arts and have some amazing skill sets to learn. That being said, would you go to the ground to fight if you were on gravel, in snow or in a men’s room??? Would you go to the ground if your attacker was more than one person? Would go to the ground if you were defending against an attacker who was armed?
Look, knowing what to do IF you end up going down vs. choosing to go down to fight is a big difference.
Ring tactics are not the same as street tactics. Stay on your feet and stand your ground.