Keybindings are, as a lot of things in Sublime Text,
JSON. Make sure you understand how to use them, they're going to save you a lot of time!
Shortcuts have to be stored in a file called
Default.sublime-keymap to be taken into account by Sublime Text.
What if I want to create some shortcuts only for OSX for example?
Well, you can. Just add
(<platform>) after the
Default. Here are the 3 possibilities: