Sometimes we spend a lot of time choosing our coffee variety or roast, forgetting about one of the most important aspects of coffee brewing: the coffee bean grinds. If you want to have a nice flavor in your coffee it's important to avoid over and under extraction of the beans, and to manage that you need to master the grind sizes. Under extracted coffees will be sour while over extracted way too bitter. Each different coffee brewer needs a different grind size, so I spend time researching the