Scribophile is a writing critique community. You critique other's works to gain karma points. Then, when you have enough karma points, you can post your work to be critiqued by others. If you are serious about writing, you should consider joining this community!
MasterClass.com is a powerhouse in the self-learning realm. Capitalize the word Master, here. This has been one of the most helpful resources for me, personally. The instructors on the craft of writing include greats such as Margaret Atwood, Neil Gaiman, David Sedaris, R.L. Stine, Steve Martin. The list goes on and on. They all have a unique take on storytelling and I've gained monumental insights from each of them.
Reedsy Marketplace is a hub full of freelancers who help you self-publish.
Another tool is Reedsy's Character Name Generator that is handy for fiction authors.
Reedsy provides self-publishing tools such as their online typesetting tool!
Reedsy Discovery is a great way to get affordable, legit reviews for your book!