How to fish in a stream?

Streams originate from high mountains, and their priorities are different because of different topography. Relatively speaking, there are few fish in places with fast water flow, which is not suitable for fishing; Slow current, water depth, fish gathered here, is an excellent fishing spot for stream fishing. Some big streams that have been hit for many years because of the high mountains and fast currents have turned into deep pools in some places, where there are often big fish and even old turtles.