Laptop keyboards tend to re-purpose function keys to handle other features. Often the default for the function keys is the laptop features. You then must press the Fn key to access the software function key options. Look out for a FnLock option.
I have found a keyboard shortcut combination to one on my favourite right click options and its quicker to use.
Comments are like post it notes for cells. They are a great documentation feature because you can add cell-specific notes to help you and other users understand the spreadsheet better. There are also a few “outside the box” uses for cell comments.