When I am trying to deploy something "README.md and good luck" is always my favourite.
"4. Other" that is welcome and helpful; wikis
A massive honourable mention is devs like Vitor Pamplona (npub1gcx…nj5z) , jb55 (npub1xts…kk5s) , M. Dilger (npub1acg…p35c) , hampus (npub1v4v…xwu8) and craigraw (npub1hea…g9v2) (to name just a few) who are active and engage first hand with end users. A bit out of the scope of your question perhaps, but it makes an incredible difference.