Bamboo shoots are normally hidden under the mud. How do we find them? Why do Chinese cooks love this vegetable?

What are the tricks when you are digging up bamboo shoots?
The camera is now focused on Guang Xi, 1500 km away from the Zhejiang province where there is another kind of bamboo shoot growing in the hot and humid forest.

How many bamboo shoots do we know so far? Winter bamboo shoots, spring bamboo shoots, sour bamboo shoots. How are these bamboo shoots processed and cooked?