personally, I think you should know yourself first and set yourself a goal. Secondly, you need to know the market you want to occupy! Now I'm trying to understand the price ratio of my products with others' products, and finally I'm cutting into the market. I'm not too expert in purchasing, but I can speak my mind, that is, I know how to do marketing first, because if you want to purchase, you will meet someone who will do marketing for you! The so-called know yourself is to know so! Maybe you are not satisfied with the answer! But this is my own idea! I hope you don't understand!