You missed the most important:
#1 leave your money on an exchanger
You were right, leaving one's coins in an exchange should not have missed that list because it is a situation till date that have been killing bitcoiners softly both newbies and the experienced alike. One was going to think it was all going to end with Mt. Gox, but how wrong one turned out to be. As at today, there is not one cryptocurrency exchange site that is safe and anyone still using them for services other than for exchanges is at great risk of losing months, if not years of efforts in one swipe.