When using TextEdit you can choose several nonadjacent bits of text and copy them or cut them. To do this you highlight the first bit of text then hold down the Command key and highlight more text. Then if you are doing a copy, you paste into your selection into place of choice. One qualifier, if you cut rather than copy the empty spaces will not close automatically.
Another thing you can do with this same trick is make changes to the font for a specific set of text.
There are lots of ways this second item can help. Ever had to go through a document and change the first letter of each paragraph into something fancy?