If I really like a fabric and have no specific purpose for it I buy two yards. I buy FQ but only in a specific color group that I want to make a scrappy sort of quilt from. I sort my material by color and put in large plastics bags like ones you buy sheets in. And all of those go in clear bins. The large pieces of material I measure and write on a piece of paper and pin it to it. I keep those together in another bin. I also have a bin of 2 to 3 inch strips I'll use for a strip quilt. I've gotten several out of that bin. When I purchase material for a special project I always buy more than it calls for. I hate to run short. I have some material that has appeared in four different quilts.
It looks like everyone has their own thing going and you will too.