I was wondering whether there is a page ID map that is a depiction of a page with the various variables identified. Not a knock on documentation on support, which is excellent here, just a tool I've used before and wondering if this exists somewhere (docs or support forum) and I may have missed it.
It doesn't cover everything (as that might be a bit overkill) but it does help to get to learn the system a bit better. With 2.3 it should be getting an update as well to help on some new things.

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