US Stock Level 2

Great tutorial to learn how to use moomoo app better...
I am new and through trial and error buying stocks... Tried understand this level 2 info from other sources to improve my trading but this tutorial really presents how level 2 data in the context of the moomoo app and the bid and ask status... I tried increasing the depth to 40 before to look at where my bid stands but never knew about the aggregation and market depth chart showing relative strength of bid and ask...
Hope to learn more of the moomoo app to be more proficient...