Learning to jump is fairly easy.
1. Start with small jumps with flat landings.
2. Roll through the jump the first time to get the feel for it.
3. When jumping it, approach it at a steady speed.
4. Stand with your knees slightly bent and your weight centered on the bike.
5. Slightly blip the throttle on the face of the jump to help keep the front-end up.
When you are comfortable with that type of jumping move on to a tabletop ( they're pretty safe also).
1. On a tabletop jump, do everything the same as above.
2. Keep hitting the jump with a little more speed each time until you are making the downslope.
Doubles are a little more advanced, but still no problem.
1. Start off just like a flat jump. Roll through the jump and get the feel of it.
2. Jump over the first part of the double and land in the middle.
3. Gradually jump a little further each time. This will help you get a better feel for how the jump is going to throw you and how fast you need to be going.
4. Don't attempt any double or bigger until you feel comfortable with the jump and the distance.
5. Remember one thing......you would rather overshoot the landing than come up short. Catching the downslope is preferable!
6. Once you decide to make the jump, don't concentrate on the gap in the middle. Just pretend it is a tabletop and aim for the downslope.
7. Once you get comfortable with jumping doubles, you can follow other experienced riders through new jumps and that will help you learn the speed and approach needed.
On last thing......if you are prepared to learn to jump, then you should also be prepared to crash from time to time. One goes with the other. Just wear lots of protective gear and put some nerf bars on the quad. They'll you keep from breaking an ankle if your foot comes off the peg during the jump.