5th: Do not trust PUBLIC WIFI
It's quite good to have access with free wifi's but have you think this: IS THIS A SAFE NETWORK? without you knowing maybe some of the people connected to that same network may have idea and skill on how to sniff passwords and credentials this method was so called DNS SPOOFING or SNIFFING if you want to use public wifi then use it not just with your bitcoin transactions.
I just wanted to write here not give anybody your private key, but noticed the fifth point of instruction.
That is very important point of your security, remember this and spread this info around.
yes I believe that this thing is the most important to remember because most of the people nowadays depends on free wifi maybe on cafe or in public places without thinking that this could be the flaw in their computers