Main?Copy, Paste, & Cut
When you are using Microsoft Windows (and Mac, I would assume), you have access to 3 very useful features called "Copy", "Paste", and "Cut".
These features are usually available in any program. You can typically access them by going to Edit > Copy, Paste, or Cut.
Or, you can use the keyboard shortcuts Ctrl+C for copy, Ctrl+V for Paste, and Ctrl+X for Cut.
Try it out, with the mouse highlight the text in bold below, and hold down the ctrl button (located on both the far bottom left and right of the keyboard). With ctrl still held down, press "c".
Highlight me, and press ctrl+C!
Open up a text editor, or anything that allows you to type. (you could even use the address bar above, just don't press go!) Place the mouse in the typing area, and click on it, like you would so you could type in that area. Now press ctrl + V, as you did with ctrl + C. You just "copied" the highlighted text, and then "pasted" it into the textarea.
But, what if you wanted to completely grab a portion of text, and put it somewhere else, like you wanted to move a sentence at the bottom of a document to the top. You would press ctrl + X (cut) instead of ctrl + C (copy) and then you could just paste as normal.
You can also do copy / paste / cut with folders and files. Just highlight the desired folders / files, and press ctrl + c, v, or x as usual.
Select All
To select an entire body of text located in a text box, just press ctrl + A, or go to Edit > Select All. Try it out, click in the text box below, and press Ctrl + A: