Giz Explains: How to Actually Make Coffee
A decent breakdown, starting with the beans and the roast. Money quote:

There’s no way around this: If you care about coffee, you have to grind the beans right before you make it. As soon as they’re ground, the oils inside the beans are exposed to air, and the thousand different flavor compounds inside start dying. Coffee’s fragile, man.

Unfortunately, doesn’t mention the AeroPress which seems like a pretty serious omission to me. My recommended serious-coffee-drinker starter- (or tucked-away-in-an-office-cupboard-) kit:
  • Freshly-roasted beans of your choice
  • A decent burr grinder
  • AeroPress
  • Good water and an electric kettle