Cannibis club, That's a really big request that could take a lot of time to explain. Best thing for first growers is to get your hands on a good marijuana grow book (bible). The nutrients are just that. Nutrients, like our body needs, so do plants. Now, exactly how you use nutes and when depends on which brand of nutes to go with. Some (most) have a set of two (A & B) that are used throughout the whole grow. Some have a set of two (A & B) that split them up for the Veg & Grow cycles. In other words you would use these two (A & B) nutes all through veg, then use another set of two (A & B) all through grow. These are just the "staples" that are used throughout your grow. There are still many secondary nutes that you will use on top, or along with these. This is where you read the literature provided when you decide what brand of nutes that you are going to go with. Ask your local hydro shop. They are usually very knowledgeable and happy to answer your /'s.