The green line indicates the Trend Bias for Price Action.  Notice that prior to changing to green, it was red.  Sentiment has changed to positive.  A great time to start looking for opportunities to buy from this point on.  Once the blackFLAG alert (Wave 4) shows up, this is giving advanced notice of strong bullish sentiment.  If you are not Long yet, you must allow price to come back down to support levels high lighted by the various up trending support lines (either purple or yellow support, or the green dotted lines.

If price action breaks below the very light blue dotted lines, then a bigger retracement is coming.  Close the trade.

Those are either Support (bottom of price action range) or Resistance (top of price action range).  Once they appear within a section, they serve as a guide of buy or selling level.  This allows for multiple opportunities to enter a trade over time.

These arrows almost look black.  There are actually some that are black (the last ten before price actually started to move up)  Those are the 1st Wave.  The prior arrows are very dark Green.  Those are wave 4 arrows).   Once the two join forces, price moves up from there.  Any touch of supports is an opportunity to buy with tight stops.