Ok, I have just started learning how to hack and several websites have recommended Linux or Unix. I kind of know what Linux is, but I know NOTHING about Unix. In regards to Linux, I have heard to use Ubuntu as a beginner. Also, I have Windows 7 on my computer and don't know how to add another OS without also adding a new hard disk. I saw that you could put them on a CD and select boot from disk and it would run independently, but I have no idea how. Thanks for helping a noob hacker just learning the skills.