Really detailed, learned a lot!

1. "Covering the futures gap" in a broad sense means: on the futures price chart, the price jumps upward or downward in a certain area, forming a blank interval with no trading price. This blank interval is called "futures" "Gap", the gap is divided into two types: high opening gap or low opening gap (also called long gap or short gap). Then the price trend reverses and returns to the jump parallel range of this price, filling the previous empty area. This price action is called "gap covering".
The reason for the futures gap in the currency circle BTC is the gap between the time difference and price difference between the futures market and the spot market.