Although guitar-power-Chords are probably the easiest, I waited to put them in because there is a danger of learning about them too early. You might think that you are GUITAR GOD and forget to learn how to play guitar! (just kidding--sort of)
ANYWAY---here they are. You can use your first and 3rd fingers (barre across the two notes on the same fret) or your 1st 3rd and 4th fingers. They are named by whatever note your 1st finger is on.
OK Just for fun--what is the name of this chord? Remember that it is named after the note being played by your FIRST finger--SO-- if E is the open string and there is a half-step between E and F-- This must be an F# chord! Hey I KNEW you knew that.