The 6 chords above are the main chords in the key of  E major.
The Key of E major consists of  3 major chords & 3 minor chords.
(Each key also has a diminished chord - more of that later!)

All Keys follow the same pattern - for example:
The Key of E major is:

E major, F# minor, G# minor, A major, B major & C# minor.

(go to Session Six for explanation of above - I   IIm  IIIm  IV   V   VIm)

Have a go at the following 6 Chord Progressions in the Key of E major.
Count 4 beats for each chord.
Make up some progressions of your own.
(In the progressions below F#m = F# minor; G#m = G# minor; C#m = C# minor