Graham Fitch talks through the correct ways to use the metronome. I know, I know, this is on piano and I’m running a guitar site, but I love Fitch’s lessons via Pianist Magazine on YouTube. I watch his lessons all the time because thinking in terms of music and not guitar can be very beneficial. It gets you away from all the guitar related complications and focuses you on the music. I used to (and still do) attend masterclasses for other instruments and have learned more about music from cross-disciplinary observation than from guitar lessons. In fact, I used to take lessons from violin and piano teachers to critique my actual musical playing.