This chart is used to capture volatility squeeze and trend.
The bollinger bands help determine whether prices are high or low on a relative basis. They are used in pairs, both upper and lower bands and in conjunction with a moving average.
The green cross on the BB means a squeeze in coming in the near future and a big move will soon appen up or down.
The EMA ribbon tells you the chart trend. When it is green you can open a long position when it flips red you can open a short position.
Keep your position until the color change.