If I have signed up for Website Management, are there plugins that I can’t use on my website?

Full disclosure, your website will be hosted on one of the most secure and advanced servers in the industry (with Flywheel). They’ve done a pretty good job of making sure that your website loads fast and is secure. With that being said, there are some plugins that can interfere with their good work, such as backup plugins and caching plugins. These aren’t needed. You can see a full and complete list of plugins that won’t work by going here.