Gmail provides keyboard shortcuts for various mail options such as for compose it is shift + c, shift + # to delete a conversation and many more. The complete list of Gmail keyboard shortcuts is available here. But these shortcuts will not work if the keyboard shortcuts is turned on for your Gmail account. You can enable the keyboard shortcuts using Gmail settings.
1. Logon to your Gmail account.
2. Click on the Settings link available next to your email id on the top right corner.
3. In the Settings screen under the General tab scroll down to the Keyboard shortcuts section
4. Select the radio option with label as Keyboard shortcuts on