Regarding how-to-fall tips, meh. There's no one way that works for everybody, every time. Usually this stuff happens too quickly so it's mostly luck.

In the past when I've fallen I instinctively used my extended arm to break the fall. Other than an occasional elbow and forearm scrape, no problems.

When I got hit by a car last month (fairly slow speed, 5-10 mph), I held onto the grips and went down on my shoulder and rolled. Hard. Snapped the coracoid process, total dislocation. I knew what I was doing. Didn't help.

The results of falling are mostly dumb luck. If we're uninjured we congratulate ourselves on our lightning reflexes and self preservation skills. In reality, watching pros in road and off road events, this stuff happens too quickly for us to react. Occasionally we get lucky. Sometimes we don't.