I help a few people with Discord as moderator, as well as owning a few myself. I've created these guides for some friends to help better explain a few concepts. I'll try to cobble these together into some sort of Frankenstein's monster via Google's website editor to share, and will try to use bold text for the most important parts for each section. Pages will be listed as I think of them and linked when they are finally created.
Note- I am primarily a Desktop/PC user of Discord; there are plenty of admin settings that are only available on desktop and not on mobile. Discord has also mentioned it is trying to clean up and better organize its settings, so some screenshots or named locations may have changed.
Channel Customization Guide
Onboarding Setup Guide
Role Setup Guide