Basic Open Chords
The numbers on the dots are the fingers to use for that note of the chord.
Index - 1
Middle - 2
Ring - 3
Little - 4
The red dot represents the root note of the chord, i.e the E notes in the E Minor chord.
All of these chords are used in countless pop songs throughout the decades, so are well worth practicing in their own right, and then apply them to songs.