There are a couple of different ways to highlight text in a Word document or in Google Drive without using the mouse. The first way is one of the answers listed above. You can hold the shift key down and use the up and down arrows to highlight parts of the text. This is good for highlighting a sentence or two, or even a paragraph in the middle of a document.
The second way to highlight without using the mouse is a little more incluse. If you are looking to highlight everything, there are two ways to do it - depending on what kind of computer you’re using. Anything using Windows can use the keyboard shortcut “control” and “A”. This highlights everything. On a Macbook or Apple computer in general, it’s “command” and “A”.