There are a lot of easy ways you can improve your coffee game, but if you can only do one thing, the experts recommend you spring for a decent coffee grinder.
Photo bongo vongo.
At this year's New York Coffee Festival, the folks at Mental Floss surveyed baristas and coffee experts about the best ways to make better coffee at home. The one thing every single one of them highly recommended is investing in a high-quality coffee grinder. As Chloe Langham, a coffee educator at Toby's Estate Coffee Roasters in Brooklyn, explained to Mental Floss, a good coffee grinder will make all of the grounds the same size so the coffee extracts at the same rate. Uneven grounds can make your coffee sour or bitter. The larger bits will under-extract and small bits will over-extract. A cheap grinder with rotating blades won't cut it, though. If you really want to get an even grind, you need to spring for a burr grinder.