
The 180 is a fundamental trick where you rotate your direction of travel 180 degrees while riding, transitioning from your normal stance into Switch.
Turn your front skate outward 90 degrees to get it out of the path of your trajectory.
Drive your back skate forward past your front skate, bringing your feet momentarily into a Tokyo-style position.
Rotate your shoulders aggressively into the turn to pull your lower body around, snapping the skates into the final switch stance.
There are several ways to build on a standard 180 spin. By maintaining your momentum instead of snapping out of the rotation, you can chain multiple spins together to execute a 360 or what JMK refers to as an infinite spin.
JMk published a tutorial video on the trick
For a more indepth look at the 180 the tutorial by CSantanaSk8 is a great learning resource