...For example, someone went to learn to ride a bicycle after reading books for three months and another person started riding a bicycle directly without reading a book and learned to ride a bicycle in a few days. ..
No, trading is not a bicycle, and it is impossible to learn how to trade without theory, as this will lead to the loss of a deposit. And with regard to your example, it may happen that someone who has ridden a bicycle for the first time may have an accident, the consequences of which may be disability or even loss of life.