The 360 flip is also known as the "tres flip" or even "tre", it is a 360 varial kickflip, it is one of the most famous skateboarding tricks.
There are many trick-tips for this, if you wish a video trick tip I'd recommend Aronl's trick-tip.
I know several ways to do this trick, I will explain two of them, I usually use the first in regular stance for my basic 360 flips, and I use the second one to do them goofy footed but also in regular stance for a few 360 flip variations.
First technique:
This is the most common technique this is based on the varial kickflip technique, so I suggest to learn these first, you will need to get them with a decent pop, this can be done like kickflips but with more back foot scooping (is this a word? ^^ ) to induce the backside 180° varial. Once you are able to land these clean once in a while then you are ready to learn the 360 flip.
Animated gif for the 360 flip with the first technique
Feet setting:
-set your feet like you would for a varial kickflip, the front is between the front truck and the middle of the deck, with the heel hanging of the heel side, ready to grip and flick.
-the back foot is on the to side corner of the tail, toes are hanging a little of the toe side.
Execution:
1/ pop the tail and scoop with your back foot to induce the 360 varial, keep your weight above the back foot.
2/ flick forward (in the direction you are rolling to) with your front foot like you would for a kickflip, this will bring the board forward which will help you for the landind and induce the kickflip, remember to jump forward, anyway you will have to manage to get where the board is going to be when the 360 flip motion is done.
3/ let the board flip and spin then land.
Tips:
-try to do them like big varial kickflip with more rotation, try to bring the board forward.
-it's easier to roll away if the trick stays in the rolling trajectory, but most of the time it doesn't, so it's important to get the full 360 to be able to roll away, staying closer to the trajectory should come with practice.
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Second technique:
this one is based on the ollie impossible technique, so you will need to learn these first, this is why I don't recommend to start with this technique because impossibles are usually harder to learn than 360flips, but if for some reasons you learned impossible first then this technique may work pretty well.
Animated gif for the second technique (this one is done in goofy stance)
Feet setting:
-set the back foot like you would for an impossible, but maybe closer to the tip of tail.
-set the front foot close to the front bolts, most of the foot hanging of the heelside and set this foot almost perpendicular to the board.
Execution:
1/ use your back foot and jump exactly like you would for an impossible.
2/ add a small flick with your front foot, you don't need to flick hard, a small push should be enough.
3/ let the board flip and spin then land, with this technique the motion is usually slower, so you may need more commitment to land.
Tips:
-do a few impossibles before trying, then do the exact same thing but add the small flick with your front foot. It's awkward at first but with practice it becomes more natural..
-with this technique the back foot does almost everything, if you have troubles it should be a good idea to tweak this foot setting and action, even if the trouble is a missing 1/2 flip (which is the most common problem with this technique).
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Variations:
-you can add some body varials to your 360 flips to get 360 flip frontside body varials or bigspin flips, you can also add some footwork to your landings.
-it's possible to break a 360 flip halfway with many things to get things such as sigma flips and Haslam flips.
-with some variations of the second technique you can do 360 double flips (same with more emphasis on the front foot's action and double kickflip-like flipping), 540 flips (more horizontal scoop, less flipping) and harder variations such as 360 flip late flips.
There are many trick-tips for this, if you wish a video trick tip I'd recommend Aronl's trick-tip.
I know several ways to do this trick, I will explain two of them, I usually use the first in regular stance for my basic 360 flips, and I use the second one to do them goofy footed but also in regular stance for a few 360 flip variations.
First technique:
This is the most common technique this is based on the varial kickflip technique, so I suggest to learn these first, you will need to get them with a decent pop, this can be done like kickflips but with more back foot scooping (is this a word? ^^ ) to induce the backside 180° varial. Once you are able to land these clean once in a while then you are ready to learn the 360 flip.
Animated gif for the 360 flip with the first technique
Feet setting:
-set your feet like you would for a varial kickflip, the front is between the front truck and the middle of the deck, with the heel hanging of the heel side, ready to grip and flick.
-the back foot is on the to side corner of the tail, toes are hanging a little of the toe side.
Execution:
1/ pop the tail and scoop with your back foot to induce the 360 varial, keep your weight above the back foot.
2/ flick forward (in the direction you are rolling to) with your front foot like you would for a kickflip, this will bring the board forward which will help you for the landind and induce the kickflip, remember to jump forward, anyway you will have to manage to get where the board is going to be when the 360 flip motion is done.
3/ let the board flip and spin then land.
Tips:
-try to do them like big varial kickflip with more rotation, try to bring the board forward.
-it's easier to roll away if the trick stays in the rolling trajectory, but most of the time it doesn't, so it's important to get the full 360 to be able to roll away, staying closer to the trajectory should come with practice.
------------------------------------------------------
Second technique:
this one is based on the ollie impossible technique, so you will need to learn these first, this is why I don't recommend to start with this technique because impossibles are usually harder to learn than 360flips, but if for some reasons you learned impossible first then this technique may work pretty well.
Animated gif for the second technique (this one is done in goofy stance)
Feet setting:
-set the back foot like you would for an impossible, but maybe closer to the tip of tail.
-set the front foot close to the front bolts, most of the foot hanging of the heelside and set this foot almost perpendicular to the board.
Execution:
1/ use your back foot and jump exactly like you would for an impossible.
2/ add a small flick with your front foot, you don't need to flick hard, a small push should be enough.
3/ let the board flip and spin then land, with this technique the motion is usually slower, so you may need more commitment to land.
Tips:
-do a few impossibles before trying, then do the exact same thing but add the small flick with your front foot. It's awkward at first but with practice it becomes more natural..
-with this technique the back foot does almost everything, if you have troubles it should be a good idea to tweak this foot setting and action, even if the trouble is a missing 1/2 flip (which is the most common problem with this technique).
---------------------------------------------------
Variations:
-you can add some body varials to your 360 flips to get 360 flip frontside body varials or bigspin flips, you can also add some footwork to your landings.
-it's possible to break a 360 flip halfway with many things to get things such as sigma flips and Haslam flips.
-with some variations of the second technique you can do 360 double flips (same with more emphasis on the front foot's action and double kickflip-like flipping), 540 flips (more horizontal scoop, less flipping) and harder variations such as 360 flip late flips.
