I hope that the official can come up with a CSS specification to help novices use it quickly

I hope that the official can come up with a CSS specification to help novices use it quickly

You need to explain better what you mean with this. Who is “the official”? And the CSS specification exists already.

I guess what we need and what you probably want is this:

  1. An “official” documentation of the plugin API and CSS classes used by Obsidian
  2. Tutorials for novices to write plugins and themes for Obsidian

While 1. can only be done by the developers, I think 2. should be done by the community, so that the developers have more time for their real work.

But don’t expect that modifying plugins and themes is something that can ever be easily done by a real “novice” without any efforts. You will need some basic knowledge of JavaScript and CSS and some effort do that, this cannot be avoided. Luckily, you don’t need to do that as an ordinary user, since there are already many built-in and external plugins and themes to choose from.