Apart from the regular lessons and studies, guitar students must buy these books and learn what is given in these books. It will definitely help them to become better musicians.
“Building Right Hand Technique” By William Bay (For plectrum guitar students)
“Mauro Giuliani’s 120 studies” for Right hand Development (For classical and finger picking students)
“Guitar Scales and Exercises” Initial to grade 8. Trinity Guildhall (Covers classical and plectrum guitar)
“Popular Music Theory” books by London College of Music. (Preliminary to grade 8)
“The Guitar Handbook” by Ralph Denyer
(It covers almost all the topics from different kinds of guitars , chord diagrams, effect processors, amplification, guitar maintenance etc.)