Install a reliable antivirus and regularly update the database, scan the system.
Do not connect to public Wi-Fi from a device that stores important data or from which you operate with cryptocurrency.
Buy a cold wallet, if funds allow.
Set strong passwords (with signs, numbers, symbols, capital letters) to e-mail, accounts in social networks, on forums.
Do not use the same passwords.
Do not store passwords, logins, mnemonic phrases, wallet addresses and other information online. Google documents, screenshots in the cloud, notes in the telegram - this is a sure way to lose money. Store the passwords in a text file on a PC that is archived with a password.