Music and computers

I know a lot of musicians, who are also tech savvy and would like to record guitar (I mostly know guitarist) to there a computer.  An I found a great way to do that.  http://www.musicrepo.com/record-guitar-on-computer and I found this site, where all you need to do is get a guitar to computer adapter.  An the hardware, but with all the available software you can use, you're off and running.