Chord Library
There are three main categories of chords – Major, Minor and Dominant. ‘Other’ will be for chords that don’t fit these main categories or fit into more than one (eg. sus and power chords). These are short central reference videos for you that explain how to finger the chords. For more explanation see the main lessons (eg. beginner course for open/sus/power chords).
The black dots with numbers show you which finger to use. O is open string and X is don’t play that string. The top of the diagram is the nut so you’re looking at your guitar as if it is upright or sitting in a guitar stand (vertical).