When you "select" something such as text (by holding the left button down) and highlighting it in blue, like this :)
What is the clipboard. I keep seeing things that say clip to clipboard if you want to keep a note. how do i do that
and then right clicking and selecting "copy" you have saved to the clipboard. You can then "place" that text somewhere else, even in another program such as notepad etc
Or right click a picture or web address like this
and select copy and then "paste" it where you want.
If you also press CTRL and PRTSC (print screen) that take a whole copy of for ex this page to the clipboard. Open a program such as wordpad or paint and select "edit" and "paste special" from the toolbar at the top and that will place this image on the screen in that program... try it :)