Deep throat tip
1.) wet his cock
2.) bob up and down a few times going as deep as you can
3.) as you come up, stop and traces his dick head with your tongue.
4.) slip your tongue out of your mouth and go
All the way down and push. Sticking out your tongue his flattens/straightens the hum of the back of your tongue allowing the head of his cock to slide down your throat.
5.) massive amounts of sticky saliva will go everywhere and make the experience a million times better even if you don't continue going that deep for the rest of the session.
Or give some guy a blow job and when he grabs the back side of your head and holds it all the way down don’t fight it.