What are the major bar chords on the guitar and how can I effectively play them?

Major bar chords on the guitar include E major, A major, and B major. To effectively play them, place your index finger across the fret where the bar chord is indicated, then use your other fingers to form the rest of the chord shape. Make sure to press down firmly with your index finger to ensure all the notes ring out clearly. Practice transitioning between these chords to improve your proficiency.