In Jin Xin, the first month (1 1 month) is not prosperous (it is prosperous in autumn), and the earthly branches are weak only because they have roots in the columns. But not the kind who is too weak to be a shopkeeper.
Wood fire is used because the water in eight characters is strong and wood fire is weak, so it can be used to balance the problem of water in life. So is fire, which also plays a role in warming the weather.