Apparently there is now a genuine "Mastodon For Dummies" book:

➡️ https://www.dummies.com/article/technology/social-media/general-social-media/mastodon-for-dummies-cheat-sheet-297062

It's a real physical book, it's in bookshops and libraries! Depending on where you live, it's out now or out this week.

I haven't read it (yet) but the index seems promising and it even mentions non-Mastodon Fediverse platforms including lesser known ones like @inventaire

(Thanks to @technomancy for highlighting this release!)