Help buffers provide the same commands as View mode (see Misc File Ops), plus a few special commands of their own.
When a function name (see Running Commands by Name), variable name (see Variables), or face name (see Faces) appears in the documentation, it normally appears inside paired single-quotes. To view the documentation of that command, variable or face, you can click on the name with Mouse-1 or Mouse-2, or move point there and type <RET>. Use C-c C-b to retrace your steps.
You can follow cross references to URLs (web pages) also. This uses
browse-url command to view the page in the browser you
choose. See Browse-URL.
There are convenient commands to move point to cross references in
the help text. <TAB> (
help-next-ref) moves point down to
the next cross reference. S-<TAB> moves up to the previous
cross reference (
To view all documentation about any symbol name that appears in the
text, move point to the symbol name and type C-c C-c
help-follow-symbol). This shows all available documentation
about the symbol as a variable, function and/or face. As above, use
C-c C-b to retrace your steps.