How can I improve my understanding and mastery of root notes on the guitar?

To improve your understanding and mastery of root notes on the guitar, practice identifying and playing the root notes of different chords and scales. Focus on learning the patterns and positions of root notes on the fretboard. Additionally, use resources like chord charts and scale diagrams to help you visualize and memorize the locations of root notes. Regular practice and repetition will help solidify your knowledge and improve your skills.