I am a new user, before Obsidian I used ConnectedText which is now no longer being sold.
Unless there is some repository of documentation I have not yet discovered the documentation seems patchy and seems to concentrate on the more advanced topics whilst leaving the basics undocumented.
A nice feature of ConnectedText was the documentation which was a ConnectedText file which was supplied and installed with the program. The documentation was a ConnectedText file which demonstrated all the features both basic and advanced in the program. If you didn’t understand a certain feature you could look at the page containing that feature and see how it had been done and edit and/or copy the markup if you wanted.
Of course if you did edit the documentation it was no longer the official version but it was made clear that it was up to the user. Also it was made clear that the documentation file would be overwritten by any upgrade. Also the unmodified version was available for free download on the website.
This would be a good thing to have in Obsidian. An Obsidian vault which demonstrated all the features both basic and advanced on pages which could be copied and/or edited by the user.
I would be willing to help with this but it is too big for me to do it alone.