Clarification

I'm new to Gridsome so pardon the (possibly) stupid question.
How does Gridsome work with WordPress (WP)? Does it require the WP blogs to be live (read in production) or in the form of files (like you would have with Wordpress.com)?
Is it better suited with the self-hosted WP option (read Wordpress.org) or the hosted one (read Wordpress.com)?

I'm planning on building a website (technically re-building one) with Gridsome for non-techy people who know how to use WordPress but I'm unsure if this pack will enable them to do so without having to know Markdown/HTML, VueJS and how NPM/CLIs work.