You don't need to know anything to learn from a chef, you can basically learn. As a qualified chef, you must know how to knife, turn the pan, correctly identify and master the oil temperature, accurately and timely feed, master the temperature, thicken, cook in time, plate and so on. In the chef industry, knife skills, spoon skills, pulp pumping and vegetable cutting are generally regarded as the basic skills necessary for chefs to get started, while in the cooking industry, the basic skills of cooking are regarded as compulsory courses and are always persistent.
At the same time, learning to be a chef requires certain cultural knowledge, tolerance and judgment. Zero-Basic Learning Chefs had better go to a good school for basic learning.
What you need to learn from a chef is a lot of practice, constant summary and persistent long-term practice. Learning to be a chef is a science. As long as you work hard, you can learn a craft in a year or two.