You steam and soak green coffee with a chlorinated, organic substance to remove most of the caffeine. There are some health concerns about it. The best way to protect freshness is by keeping coffee dry and away from oxygen. It's important to store sealed in a cool, dry place. Grinds - the difference is in the fineness.
Regular grind has a higher proportion of larger grains.
Measure 1-2 tbsp. Clean coffee maker is important. Oils from coffee stay in pot and become rancid. This gives off an off flavor. Essential to have a clean pot.