Correct, what I mean is devices should be secured as much as possible, and should be the first priority of anyone who want to enter crypto world. Without devices security, they will lose money sooner or later.
Which is very wide knowledge to learn. Its about knowing what you doing in computer world, knowing whats possible for hackers (almost everything) and whats not possible. Where you should focus your efforts to stay secure (crypto world).
This knowledge need often branches of more specialized computer knowledge to understand them.
Example from friend of friend, easiest to learn for him is by practice so he tried to write trojan horse, and he saw what is needed (from common shared knowledge) to avoid detection from Anti Virus software and now he knew that AV software is no good and you cant feel secure with it.