Learn a fighting art (karate, muy thai, anything good that you enjoy) and a grappling art (only take a fight to the ground if you have to, and if you are taken down you'll know how to defend yourself). Lift weights for strength and stay in shape with cardio. Not about how strong you are Daniel Son, bout how smart you are. Good luck, you can learn things from online if you already train but not enough if you don't. Personally I'd recommend muy thai with Brazilian Juijitsu.
Take practical, real world martial arts with full contact sparring. Don't do useless arts that claim to be "too deadly" to train. Don't fall for mystical nonsense. If you can't do it in class, you're not somehow going to magically be able to do it in a self defense situation. You don't rise to the occasion. You fall to the level of your training.
Do martial arts
join a boxing school, its fun and they will show you how to defend yourself.
I'm not experienced but if I ever get attacked...I want to be able to protect myself, even how big and strong the person is...any suggestion (videos, fighting moves, practice,etc)
