nutes are nutrients, they are the things that help the plant grow bigger faster, and healthier. NPK stands for nitrogen-phosphouros-potassium and they each have go towards important plant functions, during veg you want less potash and more nitrogen and phosphouros, during flowering you want more potash than anything else, also 20-20-20 shows how much of each plant supplement per dosage. Nutes will def help a mids grow reach its full potential, along with your applied knowledge. You should read up and become a learned grower