The second thing we mentioned was important to a great tasting cup of coffee was the coffee to water ratio.
This is something you should experiment with. Too few grounds and the coffee will be weaker, too many grounds and it will be too intense.
We recommend starting with 1 tablespoon of coffee for every 6 ounces, and moving up to 2 tablespoons to find your own personal sweet spot. This may vary from one brew method to another, and coffee to coffee.
In summary - knowing the right grind size will give you a better cup of coffee. More importantly this information gives you a tool to play and customize your perfect cup of coffee.