In the CotEditor app 
on your Mac, use Key Bindings preferences to customize keyboard shortcuts to execute menu item commands, and to store some text snippets you use frequently along with your preferred keyboard shortcuts. To change these preferences, choose CotEditor > Preferences, then click Key Bindings.
| Option | Description |
|---|---|
| Shotcuts list | Change the key bindings for menu items. |
| Option | Description |
|---|---|
| Shotcuts list | Set shortcut to insert your text snippet. |
| Insertion formart | Set text snippet to insert with the shortcut selected in the list above. When a snippet contains <<<CURSOR>>>, the word <<<CURSOR>>> will be removed on insertion and move the cursor position there instead. |
Here, you can set only the key bindings for CotEditor’s own commands. For more details about customizing the standard key bindings of Cocoa applications, see Apple’s documentation: Apple - macOS keyboard shortcuts