Master Ubuntu’s Unity Desktop: 8 Things to Know
Ubuntu’s Unity desktop is a change of pace, whether you’re coming from Windows or another Linux distribution with a more traditional interface. Unity has its own way of doing things, including powerful keyboard shortcuts.
The launcher at the left side of the screen is where you’ll launch frequently used applications and switch between running applications.
Click an application icon to launch or switch to it. If the application has multiple open windows, Ubuntu will show you the windows and allow you to switch between them.