3) Don't fuck with the trails. If you can't ride a feature, walk around it, learn to ride it or go & ride somewhere else that's better suited to your ability. Don't destroy trail features because you're a gumby.
^^^This
1. Off the brakes through the Gnar.
2. Learn to ride light and heavy and why you would want to. (Lopes Mastering MTB skills)
3. Learn basic maintenance of your own gear. (Zinn & the art of MTB Maintenance)
Sorry 3 isn't enough.....
4. Support the LBS when possible...10% over online cost is usually my limit for big ticket items, cheaper things sometimes convenience is king so a good LBS will win out.