The website is emusictheory.com.
Emusictheory is site that has great drills that can really help in the process of learning to read music. You will not have access to all of the resources for free, but you will have access to some really cool stuff. You can find the free drills here. My personal favorites are Note Names, Paced Note Names, Guitar Frets, Rhythm Performance, and Chord functions.
Each drill will have a settings option. Make sure you pick the treble clef since we are playing guitar. On most of them you can also adjust the difficulty and select or omit any notes you want to add or take away. For example, when you are first starting you might only pick natural notes.
I hope that you get a chance to check it out, I have found it to be very valuable!
Good luck on the musical journey!
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