1. First of all you have to use SSL for your website and the best ways to secure your website is purchase hosting from best providers.
2. Always keep your website up to date.
3. Always use STRONG password.
4. Check your provider is using enough software to secure your website like malware scanners etc.
5. They should use cphulk to secure hosted websites on server.
If you are using CMS like wordpress, joomla etc then you should be more aware for
security of your CMS.