I need to learn how to punch?

Question

soon.

Answer 1

practice on a wall

not a sand bag...a wall

its easy just watch some youtube videos to know how to punch

Answer 2

What zolkibar said, if you are planning to fight someone, you shouldn't, but here's some good advice(MMA for 6 years x]). Extend your arm thrumbs over your knuckles, and reach for a spot at the face. Always  remember to follow through, if you dont, the amount of pressure in a punch can be lessened around 2x. When you want a quick knock out, go for a double leg take down, to the guillotine, or fake a left punch(your weaker hand) to their shoulder or something, and at that instand use your right hand and land one perhaps on his eye or chin.

P.S. Learning some takedowns will help, also try learning elbow jabs.

Answer 3

Why.  If you are planning on fighting.  don't!

but since you didn't ask for advice.  Here ya go.

When you punch straight forward you and to make contact with the knuckles of your index and middle fingers with your wrist and arm straight.  the back of your hand should be flat and horizontal and facing up.

if you punch with your right hand your left foot should be forward.  

to hit hard lead with your shoulder.

aim for pressure points.