As the founder of my own startup, I'm forced to use Excel to do financial projection, etc, essentially all materials for my pitch deck. The only thing that worr

As the founder of my own startup, I'm forced to use Excel to do financial projection, etc, essentially all materials for my pitch deck. The only thing that worries me is accidentally doing something wrong without knowing what has changed -- stupid things like accidentally pressing Spacebar and Enter on an important cell. Because of this, I keep looking Undo just to make sure my last step is what I intended to do. I use IntelliJ and Git, so you know what I'm missing.