You can keep your Mastodon account extra safe by using Two Factor Authentication (2FA).

To activate this, log in through your server's website and go to ⚙️ Preferences > Account > Two Factor Auth, then follow the instructions.

It is slightly tricky to set up, but once it's been set up it's very easy to use.

2FA means that even if someone finds out your password they cannot log in. With 2FA activated, your phone will give you a new code each time you log in to allow your password to work.