6. Do not create account in any website with the same password you used in another website that is so important to you, lets for example bitcointalk and other forum do not use same password you never can tell what would happened since you don't control the platform by yourself. It's important to always use separate passwords.
A friend of mine is a victim of this. I have talked to him about it but he doesn't want to learn. But recently I took my time to let him know how possible it is that some malicious websites use data and even see your password from the backend and use it to try access other of the sites you visit or wallet .
7. Do not tell anyone how much is your investment or what year have you started holding bitcoin, such types of discussion often exposes' you to hackers, they don't mind using any forms of techniques to scam you since they have gain little information about you through discussion that is why it's advisable to avoid some sensitive discussions about oneself.
These type of information is hardly used by people that doesn't know you in person. It is the people that know you in person that will use this information to act very fast and maybe target you offline and rob you.
8. Do not memorized your seed phrase or private key or even store it where someone that knowns about what you are doing. Possibly avoid someone peeping through your phone and device while at home or office, there could be some spy camera watching over you.
A friend of mine kept his private key carelessly. When I cautioned him about it, he simply told me that people around him doesn't know what seed phrase is. How sure is here, even if they don't know today, they might know tomorrow.