This is the list I had from a class I taught at the 2019 American Night Writers Association Conference. There are so many other avenues of information, but these all are a good place to start.
Susan K. Quinn – She is an amazing wealth of knowledge. And is a super successful self published author.
20booksto50k on Facebook – The All-Star thread is a treasure trove of information.
The Writing Gals on Facebook and Youtube – Join this group!
LDS Beta Readers on Facebook – Great place to swap for beta reads.
An Alliance of Young Adult Authors on Facebook – Awesome resource for YA authors.
The Rumor Mills Authors Only on Facebook – This is for Historical Romance authors.
Keyword Help – This is an article I found on My BookCave about keywords.
What Categories did Amazon put my book in – A very easy way to find where Amazon put your book(s).