- The rule thumb is to always keep everything up to date and to not use any insecure or non-popular plugins and themes.
- Make sure your scripts/applications, plugins/extensions/modules and themes are all constantly updated to the latest stable
version (Very Important).
- Change all your passwords including cPanel, FTP etc.
- Do not save any passwords in your web browser or FTP client.
- Make a full virus scan of your computer and all other devices.
- Make a full virus scan in your hosting account (Virus Scanner feature in cPanel).
- Install an SSL certificate on your domain.