DO NOT use same password for more than one account
Use strong passwords (see image on right), even better use only secure passwords - one you cant remember
Password of three random words better than complex variation, experts say
Use password manager to store your passwords
Activate two-factor authentication everywhere where possible
Use application to manage your 2FA
if your account was compromised in data breach, change password of that account
if you used same password anywhere else, reset password of those accounts. DO NOT use same password for more than one account
register your email address at https://haveibeenpwned.com/NotifyMe to get further notifications in case of your email get compromised in data breach
install following extensions