If you want to swap paragraphs in a document, you COULD drag your text around - OR you could click on a paragraph you would like to move - using Shift-Alt on Windows machines or Shift-Control on a Mac and then using the arrow keys, the entire paragraph will move either up or down a paragraph.
You might want to find a document that you have already created to try this - it works great!
Send me a comment if you do try it!