Few very handy excel tips which will speed up your session a lot:
Instead of right click with your mouse and then take remove or add, use:
Ctrl + to add a line
Ctrl – to remove a line
Next very handy one:
Shift + Alt + Arrow Right = Group
Shift + Alt + Arrow Left = Ungroup
The commands are often way to far before you have reached them with your mouse.
These shortcuts might enlighten your excel session ;)
PS: Enter Enter Enter will browse you thru the cells (downwards).
Shift + Enter will skip up instead (upwards).