Sorry if this is frowned upon but I noticed that a few races are without guides. Before writing them myself I decided to search for them quickly and surprisingly found two guides that might be worth adding to this thread!
Void Elves by Morrowburn: The Void's Vainglorious Vagary - A Void Elf RP Guide
Nightborne by Korlith: https://us.forums.blizzard.com/en/wow/t/nightborne-rp-guide/102515