It is very handy to know how to quickly and accurately cut, copy and paste audio. It’s especialy useful when dealing with music. You can slice up a song to make it longer or shorter, or if you are recording your own song you can copy bits that are particularly hard to play or sing, but that repeat throughout the song. Just play it right one time and then copy and paste it whenever it needs to appear in the song.
One very helpful tool for doing all of this is the “snapping” tool in any audio editing software. This allows you to ensure that cuts and moves are musically correct. See how to use the snapping tool to do this in the article here: http://www.homebrewaudio.com/how-to-quickly-and-accurately-cut-copy-or-paste-parts-of-a-song