Justin Guitar[1] is a great place to start!

1: https://www.justinguitar.com/

Edit: ignore this, it's false. Proof:

https://www.reddit.com/r/Guitar/comments/1cgrdq/ama_this_is_...

I don't know how this stuck with me for so long, I've practically known it to be true for as long as I've been playing. Huh.

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Interesting bit of trivia I learned long after I stopped using his resources: Tommy Emmanuel is his father.

I can find no reference to this; it appears he may have three daughters but they all share his surname. Source?

You're right, thanks for catching this. See my edit.

Yousician (https://yousician.com/). It's like an interactive guitar teacher, offering backround tracks, and evaluating how you play. The really surpsising thing is how well it works.

For me it's like guitar hero (lessons are games) + duolingo (for lesson progression).

It identifies correctly the notes you play, even 1 meter from your laptop's crappy mic.

The free 30 minutes a day roughly corresponds to your fingers' daily tolerance as a beginner.

Rocksmith is good fun, if you like that sort of thing.

cyberfret.com

No other site compares.