What's what in TensorFlow 2.0

I think everyone can agree the new TensorFlow 2.0 is a revolution rather than evolution. It has greatly simplified almost every aspect of the clunky TF1. And while the TensorFlow programmers made it easier to transition to the new Framework by creating the TF2 Upgrade Script, they have undeniably complicated things a bit for newcomers. We now live in a world of billion samples and pieces of StackOverflow snippets and information that at least in the beginning are hard to navigate. You never know what is TensorFlow 1 or 2 or in-between as there was an in-between phase too to make things worse.