It is a common method to insert comments into pictures in word. I believe that most novice word users do this, that is, manually enter text comments in the middle position below the picture. If there are not many pictures in the word document, you can make do with it. Once there are many pictures, it is necessary to rearrange the picture comments when deleting one of them. This method is not recommended.
In fact, it is very convenient to insert comments in word. You can customize the label format, and you can also sort the numbering order automatically according to the picture order. Next, try to create a new word file, and then insert some samples.
Select the first picture (click it with the mouse), right-click it, and then click Insert Caption on the menu that appears.