Use Excel ISBLANK Function to check if a cell is blank and returns TRUE if that cell is blank else it will return FALSE. ISBLANK Function is the part of information functions which are useful to get a specific information from a reference.
In above example, I have used ISBLANK with IF Function to deliver a message to the user if cell F1 is blank.
To learn more about Excel ISBLANK Function you can check Microsoft’s Help Section. And, if you have a unique idea to use it, I would love to hear from you.