I use many shortcuts for my work in vim. Other shortcuts are taken by plugins.
Sometimes I would like to add a shortcut for a new command but note afterwards that the shortcut was already taken.
Is there a way to see a list of all available shortcuts in VIM? (all ctrl-shift-alt shortcuts)
Type :help index to see the mappings (shortcuts as you name them) and commands defined by vim itself.
Type :map to see the mappings defined by your vimrc and plugins. Type :verbose map to know where each mapping was defined.
Also :help map-listing to check what's displayed, but you probably already know about it (it's in map.txt help manual).
If you also want to check which maps or commands are defined by vim itself you can use
:help index
:map //lists all the shortcuts that are assigned.
map also takes a key combination as an argument that lists only the shortcuts assigned to this key combination.
To list all the mappings assigned for Ctrl-V:
:map <c-v>
I found this helpful...
http://www.viemu.com/a_vi_vim_graphical_cheat_sheet_tutorial.html
If you want a sorted, searchable list of your current mappings to look for unused keys, see my answer at: How to search in the Vim mapping listing?
As a starting point, for the keys are not mapped by default, see
:help map-which-keys
You can use :map < key > to check a specific mapping. Example: to check Shift-F2, :map S-<F2>.
AFAIK, there's no way of getting a list of what's unmapped without writing code to iterate through each possible key combination and check if there is any output from running :map < key > for that particular key.
来源：https://stackoverflow.com/questions/5390683/vim-available-shortcuts