How to make a profit on online retailing?

I don’t get how you would make money trying to sell products online because your trying to lose profit making your products lower than normal. Another questions I have is how do you get the products to sell? If you made a website that has a lot of stuff on it and someone purchases a lot of stuff where is the item they bought? Do you have it in your storage? I don’t know where you keep all the items that you advertise online..
Answer #1
Most online stores buy items in bulk and buy direct from the manufacturers, that’s why they can give such low prices.