A good resource for genealogical research are state departments of archives and history. Many of them have digital collections and you can click your way through hundreds of years of history.
I keep returning to the Georgia Archives. It’s easy to use and I always find something new. During my last visit to the site, I discovered a marriage certificate for my great-grandparents, Dorsey and Adline Clayton Pinkard and another certificate for my great-great-grandparents, Crawford and Laura Dobbins Bryant.