I think for all parties, if we had the ability to send a "two day backstage pass" (you can use that), where we can send a friend a link and they could try the sight for free but couldn't submit videos. I have a few friends that I keep trying to sell them on but they just are not totally sold and I think it's because the beauty of this site is the personalized VE's are. The interaction between student and teacher is what really makes this magical and it's really hard to describe. The search feature could be a little better, more precise and sometimes it finds no VE hits on simple searches like street. Otherwise I am one of your biggest fans.
Unlike many string instruments which use a bow to create a sound, guitars are played by plucking or strumming the strings on the instrument, which vibrate to create a sound. Chords are played when the guitarist holds their fingers down on more than one individual string to change its length, which in turn changes the frequency of the vibration created - in other words, it creates a different note. Performers often use guitar tabs, rather than sheet music, when learning music: this acts as a kind of 'map' to teach guitarists where to put their fingers on the strings.