I have an MacBook Air, which keys do i use to connect it to a projector

Which keys do I use to connect my MacBook to a projector

When you physically connect the mac to a projector (which is turned on), it should automatically detect the projector and configure itself.  This can take a second or two. 
System Preferences, Displays will provide you with a few options on how the external display will behave (e.g., mirrored).
In the Display preferences if you press the option key a button "Detect displays" will appear which will allow you to manually force the computer to connect to a display.

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