Discourse is quite simple to administrate.
Root access to the server is required (this is not mandatory for a Wordpress site).
The command line is sometimes used for very basic commands (upgrade via ./launcher rebuild app).
Ideally, they would know at least the basics of how Discourse works for users AND admin: site settings, simple official or third-party customization, moderation tools and features.
The support forum (that’s us, hi! 
) is very helpful, and many issues raised by self-hosters are resolved by the community.
ask.discourse.org, an AI-powered search based on Discourse-specific information, often returns very helpful answers as well.
If your forum is already online, it can be helpful to share here some info about it. Is it self-hosted, does it have customizations (themes, components, plugins), how active/large is it, etc.