I want to share this amazing online application that I have been using for years. The great thing about it is, that it is free to use and download.
One thing that is important when playing and understanding the guitar is to know each note in the guitar,
Sure I know every note immediately before 5th fret but after there I have to stop and think for a bit.
This website has many different trainers that tests you on the notes of the guitar.
There are also trainers for key signatures, intervals and many more.
Check it out
http://www.musictheory.net
Enjoy
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