Chef's are people who work in the kitchen, and are in charge of the food. They will create a menu, give everyone in the kitchen a job to do, and make sure that the food is made properly.
Being a chef is a very high-stress job. You have to be very creative to come up with original food ideas. You also have to know something about flavors, smells, color, and how they combine with heat or cold. For every evening, you will have to guess how many dishes you will make, and order everything you might need from the grocer's, butcher, or shop.
Look at the video below to learn about verbs (= action words) that are relevant for in the kitchen.
You can also do the interactive video below to learn more vocabulary: