Missing manual: Spacemacs keymaps - discover, amend, bind

[vkz]

Documentation explicitly says

There is much more to say about bindings keys

I feel like this is a big piece of documentation that's unfortunately missing. It is no obvious where the stuff bound to keys is coming from, nor is it always possible to figure out by grepping the sources. I am mostly talking about the core or Spacemacs base. Would be great if someone with deep knowledge of the codebase could write this stuff up, cause Spacemacs seems both quite systematic and coherent so this should be possible.

PS there maybe a feature request lurking somewhere here: make all nested keymaps explicitly available from user code for keybinding. Here's an example: what exactly is dotspacemacs-major-mode-emacs-leader-key bound to in this buffer and how do I get the same map available on a different key? So that which-key continues to work for it. Same question for some other nested map? Combination of maps? Etc.

PPS As much as I would like to contribute I have very little idea about the core code and what Spacemacs is doing, alas.

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