[Question] Dumb question: what's the simplest way to build a simple website with this?

This is a really dumb question, but I'm not finding the answer anywhere obvious: I'm a beginner with a free JS codecademy course under my belt and a lot of time spent making/maintaining sites on WordPress. I want to make a new website or three using open-source tools that'll be more user-friendly for myself and end users and leave behind some of the unnecessary complexity and security holes that my webhost is always complaining about with WP.

So I started looking for open-source page builders. GrapesJS' interface looks fantastic, but I'm having a hard time finding the rest of the tools I'd need to build an actual site - I'm guessing the an actual CMS it's meant to be embedded inside. Are there any open source CMS' that use grapesJS that I could install on my server and set something up with? Thank you!