By default Ctrl+[1-9] to create control group. Alt+[1-9] to select it. What I found is you can press Enter type +switchalt to just press 1-9 to select a group. Game doesn't make autosaves, even after finishing campaign mission, so make sure to save often. ~ key to display units healt bars and control groups assigment. F2 to enter main menu. Help under main menu to display all the others keybinds.
