From FDT Documentation
Using shortcuts in FDT is one of the most important techniques to increase your coding efficiency. For your convenience, here you can find a collection of most important shortcuts that will enable you to work without the need of the mouse.
The FDT shortcuts may differ depending on the Operation System used due to system specific shortcuts and keyboard layouts.
The shortcuts for Linux are the same as for Windows. For a full list of all available shortcuts go to the shortcut preferences Preferences => General => Keys. You can also edit all shortcuts there to suit your personal needs.