Wish the state's revenue website was as comprehensive as the federal's. Seems to raise more questions than it answers and can't even get through on the phone with them.

For the second link, is that all corporations or only C corps?

And what about the net worth tax?

It's all corporations.  You will note in the pdf link that you can download on the state website, but available here as well:  <a rel="nofollow" target="_blank" href="https://dor.georgia.gov/sites/dor.georgia.gov/files/related_files/document/TSD/Form/600S_2017_Corpor...>, that there are two taxes:  Schedule 1, which is a flat 6% tax on corporation income, and Schedule 3, line 7, for the net worth tax (if that applies).  S-corps are also liable for this Georgia tax.

Do I need to include a copy of the 1120S with the GA form 600S?

Yes. A copy should be printed out with the 600S from Turbotax Business.