I want to learn how to use a built in package (e.g. ediff). This built-in package has an online manual in html, but presumably this content is also available from within emacs.
How do I view it within emacs?
Aside: I have also tried to find the pdf for the ediff manual (for offline reading), but cannot find it. The solution to the above problem would solve it, but it would also be good to know if / how I can find / create a pdf of an emacs builtin package.