The coffee knowledge library
Clear, practical guides to beans, brewing, espresso and the science in your cup — for curious drinkers and home baristas alike.
Featured · Brewing Guides
A simple, repeatable V60 recipe — 15 g of coffee, 250 g of water, about three minutes — plus exactly what to change when your cup tastes sour, bitter or flat.
3 min read
Beans & Origins
Two species produce almost all the coffee we drink. Here is how arabica and robusta differ in flavor, caffeine, growing conditions and price — and why both matter.
3 min read
Health & Science
An average 240 ml cup of brewed coffee has about 95 mg of caffeine — but the real range is huge. Here is how much is in espresso, cold brew, instant and decaf, and how much is too much.
3 min read
Coffee Basics
Specialty coffee is more than a marketing word. It is coffee that scores 80+ points under the Specialty Coffee Association’s standards — here is what that score measures and why it matters.
2 min read
Coffee Drinks & Recipes
A café-quality cappuccino needs three things: a good double espresso, well-textured milk and the right proportions. Here is the recipe — plus a no-machine version.
3 min read
Roasting
What really changes between light, medium and dark roasts — from first crack to flavor, acidity, body and caffeine — and how to brew each one well.
3 min read
Coffee Basics
Oxygen, moisture, heat and light are the enemies of fresh coffee. Here is how to store beans, when to use them, and whether freezing really works.
2 min read
Coffee A–Z
Plain-English definitions for 59 words you meet on coffee bags and café menus — from bloom to TDS.