Great list! I will add: keep the seed words offline, safely, without any chance for others to get access to them; the seed has to never touch a device that will ever go online. Keeping the seed as copies in multiple geographically distinct places is also a good idea.
That's a very useful tip which everyone should adopt. I also think all wallets should disable the option to take screenshots of seedphrases, so users know to write it down and not just store it in an electronic form.
Keeping copies in different geographical location is a good failsafe, but this should only be done if you can assure the security in all the locations. Better to have one point of failure which you can adequately protect except against a natural disaster, than having multiple back ups that are not secured.