Doug has an old HP computer and he wants to put Linux on it. Leo says he's a huge fan of Linux. It's free, it's a lot easier to use than it used to be, and it's far more secure. It's a great way to learn.
Doug could check out DistroWatch.com to find the best version for him. Leo prefers Ubuntu, and his favorite is Debian. There's a lower requirement version called XUbuntu which is designed for older machines.