360 g turns are one of my favorite tricks.
try to learn it off a ledge. it will be much easier. the way i think of it is like a 180 g turn on the ledge, then pop the other 180 while falling off the ledge.
Start by doing a 180 G-turn and land on your back wheel and pivot out. Then slowly start jumping more and more, still landing on your back wheel and pivoting untill you can tuck up enough to land both wheels at the same time. This trick is a lot about momentum too so do a set up turn
try to learn nose manuals supper god and hang fives supper good because 360 gturns is all bought balance and be prepared to go fake nose manual for a tad while doing them
issac is right just learn 180 nose pivots to fakie then start jumping off the nose pivot and practice a lot think of it like a 360 flat at first, you'll get em
but to do them flat speed is key, not too much not to little though.
and really huck your shoulders around so you get a good spin and once you feel like you are around enough and/or about to fall just pop off your front wheel and spin the rest of the way.
its one of my most inconsistent tricks but also my favorite. it takes a lot of practice, but just remember to huck your shoulders a lot. thats what truly helped me.
Go fast to get some momentum going, carve hard in the 180 G-turn and as soon as you hit 180 pull your bars to the direction you're spinning and it should pop you around
Practice bunnyhops with your front wheel (Nollies)
Do the g turn then when your front wheel starts to go backwards, you push down then up and pop of the wheel rigjt after it starts to go backwards. Thats the key, and dont be flimsy with 3g's, have a stiff body