If you want to learn that kind of stuff then look up wrestling, MMA wrestling, I'm sure there are videos on it out there. I'm gonna guess you're 12-14, honestly you'd be better off learning how to punch, I'm 6'5 and I was a really strong kid, the strongest in my school year but I never learned how to punch properly until later in my life, I'd really recommend learning how to throw a punch with your weight behind it, it's almost like magic how you can just tap a guy on the jaw and he'd go down. Taking guys down is dangerous in street fights, you can get kicked in the head when you're down, it happened to me when I fought a kid when I was about 14 and I got jumped for "grabbing", after that I only tried to throw hands with people but I only got in a couple more fights until I left school. I'm not some tough guy or anything, but I grew up in a rough school in London and everyone fought at lunchtime for fun. The thing is taking guys down isn't enough to end a fight in a real situation, it's fun to wrestle with your friends like that, it's just friendly competition, but if you actually want to learn self-defense then learn how to do a double-leg takedown, a trip, a body throw (like in Judo) and you should be able to take most people down from any position. Slams are dangerous for both you and your opponent, you can end up killing someone that way. Look up YouTube videos on throwing punches, you only have to learn how to throw a basic punch with power behind it and have the will to be able to punch someone before they punch you. One of the things I learned was if anyone ever starts a fight with me, don't wait for them to swing first, you already have justification to swing once they get in your face. Have fun.