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Not able to find ANY documentation whatsoever. For example, when I google "what is wp:site-logo" it just takes me to adding custom logos via the UI / the editor. But I want to understand from coding point of view. Clueless. Hopeless. I'm right now

Hello,
You can find general documentation about using blocks here :
[https://developer.wordpress.org/block-editor/](https://developer.wordpress.org/block-editor/)
Also, here is the documentation (with source codes) for the Core Blocks :
[https://developer.wordpress.org/block-editor/reference-guides/core-blocks/#site-logo](https://developer.wordpress.org/block-editor/reference-guides/core-blocks/#site-logo)