Online Videos or a DVD?
The two most popular alternatives to learn to play guitar on your own are either purchasing a guitar lesson dvd or enrolling in an online video lessons membership. The first thing to consider is can you picture yourself watching guitar lessons on your computer screen? You have to be connected to the Internet in order to watch lessons online, therefore you probably have to watch them on your monitor. Of course, dvds can be watched on your computer as well, but you also have the option of watching those lessons on your TV via your home dvd player.
What do you want to learn?
I know, you want to learn to play guitar, but more then that do you want to learn to play popular songs and jam with friends? If so then you want to find a program that teaches you chords, some scales, and of course strumming techniques. You can probably go without a bunch of theory lessons and learning to read music for now.
Now if you want to learn how to read music, and become a more established musician you're going to want to find a website or home study course that offers in depth theory and reading lessons. If there's anything some programs skip it's the theory part, it's not exciting, and most beginners don't like it.
Both methods, online video guitar lessons, and offline dvd guitar lesson can provide you with an excellent education on the instrument. It's my opinion that if you're going to be taking your lessons very serious you should buy a guitar lesson dvd home study program. Most of the time, these products take more care in the quality and organization of their lessons. This includes teaching more about reading music, and music theory.