One of the first things you’ll need to be able to decipher when starting to learn the guitar are chord charts, or chord diagrams. It is fairly straight forward, so have a look at the video if you’ve been having trouble reading guitar chord charts.
A chord diagram is a visual representation of a guitar chord. There are 6 lines going from left to right and six lines going from top to bottom.
Of course, you could have a guitar chord diagram, where the topmost line is not the nut, but a fret further up the neck of the guitar. This would be indicated by “5 fr” for example, meaning that the upper line is fret 5, the second line fret 6, and so on.