No matter in which mode I am currently in, is there a general way / key combination to open the help file related to the currently active mode?
There's M-x describe-mode
, which is bound to C-h m
by default. It shows the current major mode, as well as all current minor modes.
If you want to jump directly to the description of your current major mode, then either evaluate (describe-function major-mode)
(via M-:
) or bind it to a key, for example:
(defun my/describe-current-major-mode ()
"Describe the current major mode via `describe-function'"
(interactive)
(describe-function major-mode))
(global-set-key (kbd "<f5>") #'my/describe-current-major-mode)