Thanks guys im getting into these power chords. Just learning smells like teen spirit and for a beginer its a good tune to learn..
I have noticed that so many songs have the format shown below just moves around the fret board which is cool.
But i get the part of the 1 on the E string use index finger but the 3 3 I use my pinky and ring finger for is there an easier way this the only prob with tabs they dont tell you which fingers to use.Oh and im dumb lol.

|-------------------|
|-------------------|
|-------------------|
|---3---------------|
|---3---------------|
|---1---------------|