This is a great one.
How about
Take enough emergency gear to survive an unplanned bivy, not enough to make it comfortable.
Scope out complicated routes from a distance and memorize key landmarks.
When hiking steep slippery terrain, like ball bearings or talus, the goal should be that you will not slide uncontrollably. Short contolled slides are acceptable. Many newbies seem to need to make sure that they will have perfect control with each step. That wastes energy (and nerves).
That said, do everything you can to avoid creating rockfall.