In this lesson you will learn how to use your comments in Excel.
Comments are functionality, which allows you to store text information about the data contained in certain cells of the worksheet.
If you want to change the content of the comment, format it, or delete, the cell must be re-click the right mouse button. You'll see that in the context menu there are new entries to permit above steps. The last of them Show / Hide Comments will simultaneously display the comments on a permanent basis (or hide them again later). With this feature, you do not move the mouse to turn on all the cells that store comments to see them.
By default, comments do not appear on the print - serving only storing text information that is complementary to display the contents of a cell. However, if you want to print them, this option can be set to the settings on the sheet.
Further reading: How to print a full page chart? How to print all tabs? Functions 101