Is it hard to make cheese?
Making cheese isn't particularly hard, but making high-quality cheese is incredibly difficult. That's why master cheesemakers go through a rigorous training program. To graduate from Wisconsin's Master Cheesemaker program, for example, you must have 10+ years' experience as a licensed cheesemaker in Wisconsin, complete a series of challenging courses and pass a final written exam that can take up to 40 hours to complete.
What is rennet?
Rennet is a set of enzymes that is traditionally harvested from the lining of the stomachs of young ruminant animals like calves, lambs, or kids (young goats). These enzymes coagulate milk by causing the casein proteins in it to cling together and to separate the milk curd from the liquid whey.
Why is some cheese aged?
The longer cheese ages, the more the lactose in the cheese is converted to lactic acid and the stronger the taste of the cheese becomes.