There are a lot of key factors for a technical analysis. I don't know the other since I am not a pro trader but I only know one thing the High liquidity. In which you can easily identify based on volume that you can see in every exchanger sites like binance.
For example: currently binance top volume coins are ETH and EOS. Since this type of coins has a huge number of volume the price can be very volatile more than any other coin. This could be the key for traders to dive in and out in a short period of time.
PS: I guess you should have explain the topic more rather than letting us to watch a video cause that might be just a form of marketing strategy for you to gain more traffic on that video.