Top 4 youtube channels to learn guitar for beginners

JustinGuitarSongs

Justin Sandercoe is the best online guitar teacher. Period. There are a lot of  guitar tutorial videos out there but no one has put so much of thought  and effort to create videos as well as organize them into well-designed  courses categorized by levels of difficulty, style and techniques. He has 2 YouTube channels having hundreds of guitar tutorials. But for the  courses you will have to visit his website. These courses have material  for beginners, intermediate as well as expert guitarists. His website  also has material on guitar theory, ear training, transcribing and whole  lot of other good stuff. And he gives away all this for free.

JustinGuitar

This is the other YouTube channel by Justin Sandercoe.

LickNRiff

If  you are more into fingerstyle guitar then LickNRiff is the best YouTube  channel for you in my opinion. This guy makes learning fingerstyling  look easy and fun. Videos also include various improvisation techniques  and methods. Tabs for all song tutorials are available on his website.  He also takes requests to make fingerstyle arrangement for songs through  his website.

GuitarJamz

Marty Shwartz is another great online guitar teacher, especially for  beginners. The channel has tutorials from few other teachers as well and  has a large collection of videos.