New to TidBit

Couldnt find a general discussion topic for folks new to Tidbyt and its basic functions - a few questions:

-Is there a “proper” way to power on and off the Tidbyt? or is it just done by plugging in/unplugging the cord?
-Is there a way to hold on one app rather than a continuous rotating loop? Is scheduling the only way to do this?

Thank you