https://www.musical-u.com/learn/5-reasons-every-guitarist-should-learn-intervals/
Have you wondered how some guitarists seem to just know what notes to play?
They can pick out a tune by ear, play along with a song they’ve only just heard and improvise killer solos without any need for sheet music, tab, or fretboard patterns.
How do they do it?
The answer is that they have a well-trained musical ear, and by doing simple ear training exercises on guitar you can hone your own ears in the same way.
Here are 5 reasons every guitarist should learn intervals