What are some useful keyboard shortcuts?

If you find yourself in a software bind, try pushing the F1 key. This
will instantly take you to the Help menu of that program you are using.

If you highlight something you want to copy then hold down CTRL and tap
C it will copy the highlighted text or picture.

If you have copied some information and you would like to insert or
paste it somewhere else you hold down CTRL and tap P.

If you mess up on a copy paste and you want to undo the damage then you
should you hold down CTRL and tap Z repeatedly until you get back to the
desired state.