I am a great fan of Dave Chesson’s “kindlepreneur,” which helps you select categories and keywords for Kindle Direct Publishing (Amazon). But his articles and discount offers are equally helpful. (Both Sarah and I used his discount coupon to get ARCs posted to NetGalley at a fraction of the going rate.)
Dave has just posted an article on Updating and Republishing on Amazon. This may be no-brainer to many of you, but others who are self-publishing may find it helpful. Explore Dave’s site. You’ll learn a lot about the mechanics of publishing on KDP.