YouTab’s chord map shows you how to finger each chord in the song you are playing.
The chart shows you the guitar strings arranged from the high E on top to the low E in the bottom, like they’re arranged in a tab. You can see the bottom strings are thick and the top ones are skinny. That’s to help you find your way if you get confused.
The numbers at the bottom of the chord chart are the fret numbers.
The dots show you where to place your fingers.
Strings that are lit should be played, and those that are not shouldn’t.
For example, an E chord will be shown like this: