An addition to what have already been said above... about the 200 SMA.
How do most traders use the 200SMA ?
Most of us thinks that the 200SMA acts as a strong support/resistance line. It like a dynamic S/R. If you plot a 200SMA or EMA on a chart and scroll back in history, you will notice how often price will bounce from it. Also, when in an uptrend, price will usually be above the 200SMA/EMA and the reverse for downtrend. If its going above and below the 200SMA on and on in whipsaws, then market is undecided and is ranging. I hope I have added some useful stuff to this.
All the best