Pinch

Never underestimate the pinch. For ex: when all else fails, 95% of the time you can use a pinch, say for example if your in a head lock that you don't know how to get out of. Also, don't pinch with two soft spots on your hand(the tips of your fingers). Use the middle knuckles of your index finger and thumb. Can hurt very badly so don't play around with.

There are break out techniques for headlocks etc. which you will learn as you become more advanced. The pinch is all very well against an opponent who is playing, but in real life people will punch you if you do that. Very hard. Still, keep training.