Have you ever wanted to highlight a complete document or page all at once instead of dragging your mouse all the way from the bottom to the top of the page just so you can copy and paste it somewhere else? Are you tired of holding down the shift key while arrowing down line by line? If it is two pages or more, it can get redundant to use your mouse or arrow keys for all of the text. Sometimes your finger slips off the mouse or shift key and you have to start all over again. You've had that one happen more than once I'll bet.
If you're tired of all that nonsense, you can select all of the text on a page all at one time. All you have to do is select it all!
There are two ways you can do this. One is going to the Edit menu in whatever program you're working in (a Web page, MS Word, etc) and choose Select All. That will highlight the complete page of text, pictures, etc. Then you can just copy and paste the material wherever you want it. The job will be done much faster than using your mouse or arrowing down the page!
The other way to select it all is by using Ctrl + A. This keyboard shortcut will do the exact same thing. Just click once on the page you want to copy, press Ctrl+A at the same time and poof, it's done! People who use a screen reader simply hit Ctrl+A and everything is selected.