You will want to know what specific software is being ran on your server and ensure that it is running a stable version and not vulnerable to security vulnerabilities. Software is what exposes you to risk, but it is also what runs your business website! So you want to be intentional in what is being ran, and ensure that software and services that you are not using are turned off as there is no point in exposing yourself to potential risk if you don’t have to.
In order to find out what software you are using, your web hosting provider should be able to specifically tell you the software, versions, and configurations that are being used. If they are not able to do this, it would be another indicator that they are not on top of their game as a web hosting provider. Another method could be to perform or have a company perform a service enumeration and vulnerability scan against your server. This would definitively show what is being exposed to the public internet, and what security issues might reside from a network perspective.