I also didn't read the manual very often, because I didn't find it
easily.
Can you suggest a way to make that easier for others in the future?
My suggestion would be to add links in the docstrings to the relevant
chapter in the Emacs and Emacs Lisp manuals. Three examples:
kill-line would have a link to (info "(emacs)Killing")
kill-buffer would have two links, one to (info "(emacs)Buffers") and
another to (info "(elisp)Buffers")
call-process would have a link to (info "(elisp)Processes")
I think a link to the relevant chapter, as in the examples above, is
better than a link to the relevant section or subsection. With this,
users who follow that link would find more information about the
general context of the command or function, and not just a similar
documentation.
Try
C-h f kill-line
put point somewhere on 'kill-line' in the docstring
C-h S
Now making that more widely known would help, I think.