Memorize This!

Note to self, commit this stuff to memory!

These are some good facts to know. They'll help get you out of a jam or help you get a good base setup when your meter fails.

My favorite one is:
3. Camera shake rule The slowest shutter speed at which you can safely handhold a camera is one over the focal length of the lens in use. As shutter speeds get slower, camera shake is likely to result in an increasing loss of sharpness. So, if you're using a 50mm lens, shoot at 1/60 sec or faster. Not enough light? Use a flash, tripod, or brace your camera against a solid object.

Then again, an IS lens adds an addendum to this rule.