Ctrl + A
To select everything in a given range without messing with your laptop's track-pad or mouse, simply click once inside the selection, hold Ctrl and push the letter A.
Ctrl + C
To copy what you just selected without accidentally deselecting it, hold Ctrl and push the letter C.
Ctrl + V
To paste what you just selected, (while the selection is still active) hold Ctrl and push the letter V.
Ctrl + X
To cut a selection, hold Ctrl and push the letter X.