Example for getting a basic FreeCAD workbench started
$ mkdir ~/.FreeCAD/Mod
$ cd ~/.FreeCAD/Mod
$ git clone https://github.com/skaiser/FreeCAD_Workbench_Starter.git
Create a soft link in your home directory to make it easier to add things like icons from the file browser windows.
$ cd
$ ln -s ~/.FreeCAD/Mod/ .