I wanted to share a really helpful keyboard shortcut I just discovered.

Ctrl+Shift+N goes to StandardForm. Ctrl+Shift+T goes to TraditionalForm. Ctrl+Shift+I goes to InputForm.

F1 on my computer opens the Documentation Center and searches for something, even if you can't right click and select Get Help because its a text cell.

Ctrl+Shift+Enter evaluates in place.

Ctrl+L gets the previous line.

I have used Ctrl+Shift+Enter with Iconize and Inactivate. It could also be used for entering a Graph as a picture of a graph. I was wondering how the Documentation Center used Graph as input as a picture, and now I know how.

I have used Ctrl+Shift+T with DedekindEta for the number of self-conjugate partitions of a given length.

Ctrl+Shift+N and Ctrl+Shift+

I have used Ctrl+Shift+I to go from Inactivate[p q r, Times] where you can't see the FullForm to where I can see the full form. This is helpful.