If you only need to screenshot part of the screen, there's a simple way to do it for both Windows and Macs. For Mac: "Command," plus "Shift," plus "4" brings up the tool. Then you just drag the area you want. If you click the "middle" button on your mouse, you will open the link in a new browser tab. And if you middle-click an open tab, it will close it. All you have to do to make a copy of a file on a Mac is hold the "Alt" key ("Control" if you are using a PC) and then click and drag the file. This will make a copy that you can drop anywhere you want by un-clicking. Most people know you can hit the space bar to pause a YouTube video, but sometimes this causes it to scroll down the page if you haven't already clicked on the video. If you press "K," this will play (or pause) the video every time.
