Final answer:
To add space between text in Excel, use the CONCATENATE function or the ampersand operator with a space. To add a comment to a cell, select the cell, click 'New Comment' on the ribbon, and type in the comment box.
Step-by-step explanation:
Adding space between text in Excel can be achieved by using the CONCATENATE function or the ampersand (&) operator. For instance, suppose you have a first name in cell A1 and a last name in cell B1 and you want to add a space between them in cell C1. You can use the formula =A1 & " " & B1 or =CONCATENATE(A1, " ", B1) in cell C1. This will combine the text with a space in between.
However, if you wish to add a comment to a cell rather than combining text, you would first select the cell and then click New Comment in the tools ribbon. A comment box will appear where you can type your comment. Comments are useful for making notes or providing additional information without changing the actual cell content.