A fast move
Jumping over a flight of steps.
At worst, you just need to go fast enough to clear a flight of steps and land flat. Free-ride full-suspension bikes are a better bet for this.
Understanding the move
Pull a manual as your front wheel leaves the edge.
Build up enough speed before take-off and stop pedalling just before reaching the drop edge, concentrate on your balance. Pull on the handlebars and ride into a manual to maintain the front wheel up while you approach the edge on the rear wheel.Bear in mind that in extreme downhill or free-ride sessions, riders nearly always land into a slope, so that the suspensions do the work progressively over a fairly long stretch.
Landing flat is painful
If for some reason, you pull too much on the handlebars during take-off or if you lean back too much, then you may end up landing in an uncontrolled manual or a desperate wheelie,
which is really risky until you use the rear brake.
If you don't pull enough on the bars, the bike may dive forward, and you'll land on the front wheel instead, which can be ugly and a good introduction to a crash.
Landing flat won't do any good to your wrists either. As usual, start jumping off small kerbs and progressively build it up. Learn the other proper drop-off techniques.
Straight jump: Free-Ride style
1° Build up enough speed before take-off and stop pedalling just before reaching the drop edge, concentrate on your balance.
2° Pull on the handlebars and ride into a manual to maintain the front wheel up over the edge (if you go fast, you can stay more centered).
3° Shift your weight backward, arms fully stretched to maintain the front wheel horizontal as it leaves the step and dives into the air.
4° Once in mid-air, just let the bike drop naturally to the ground, extending your legs before the bike impacts with the ground.
5° Because you cruise at a good pace, it is safer to damp the impact with both your legs and arms as you lean over the middle of the bike.
6° Depending on the terrain, try to control your brakes to a progressive stop while you flex over the bike to absorb the impact further.
180° and 360° jumps
Give a strong twist during take-off.
To perform a 180° or 360° jump, the whole idea is to give a strong twist to what would otherwise be a straight jump. Like for a 270° side drop, you must initiate the rotation during take-off, with plenty of torso inertia on a skewed bunny hop impulse. Take-off is the same for the 180° and 360° jumps, only tucking for longer or jumping from higher for the full 360° turn.