Typically guitar chords are played as 5 or 6 note bar chords or open guitar chords at the neck. But also commonly guitar chords can be played as 3 note triads.
Guitar triads are 3 string chords achieved by muting the unplayed strings. Instead of playing bar chords & open chords, chords can be voiced in 3 note groups.
The major blues scale adds a flat 3rd to the major pentatonic scales. The scale has six notes made up of the 1st, 2nd, flat 3rd, 3rd, 5th and 6th scale degrees.
The major pentatonic scales have the same five basic shapes as the minor pentatonic scales. However the root notes and positions are shifted up a third.
Metal style guitar scales always uses three notes per string and always moves the fingers up the fretboard in a diagonal pattern. This style is common in metal.
If you know how to play the minor pentatonic scales you can easily teach yourself the blues scales, especially if you know where the 4th and 5th notes are.
Practicing pentatonic scales is a good way for new guitarists to build finger strength & dexterity. Improvising on the pentatonic scales is a fun and creative.
Travis style fingerpicking, named after guitarist Merle Travis, is a guitar technique for right hand picking commonly played on a steel string acoustic guitar.