Tip: don't start chugging until the liquid hits your lips or else you'll get a belly full of air and feel like shit and burp a lot and possibly throw up. I've seen many amateurs do this while bonging beers.
i find the best way to bong a beer is to keep my teeth together so the beer flows through them. it makes it way easier to handle and i have yet to throw up.
Honestly, relax the throat, and the beer should almost flow freely as fast as gravity will let it. Cold beer makes your throat tense up, so its alot easier to chug warm beer *or rams piss*
I don't know if you mean like what to drink out of or the technique, but if you mean technique just relax your throat, head back and take large gulps. It comes natural for me im not a big kid but I can shotgun a beer like no other
If you're chugging out of the bottle try and keep air flow between the bottle head and your mouth or it awkwardly suctions to your lips then goes everywhere.