It all depends on the plugins you use:
When the author says that mapping
: may break a plugin, they simply mean that you won't be able to use
; anymore and if a plugin has a command which uses the
; the command might not work anymore.
Now this mapping is pretty common on qwerty keyboards so it shouldn't be a problem on most plugins.
Your best bet is to use this mapping and see if you encounter a plugin which uses
;. If that is the case you can either stop using the plugin (or try to replace it) or remap another key to
nnoremap : ;) and use
: instead of
Note that in vanilla vim
; is used to repeat the last
On a totally different topic, don't use
nnoremap instead it is much easier to read and considered as a best practice