Brew better
Six controls, in the order that changes the cup most, and what to do when it goes wrong.
Beginner
1. Water
It is most of the cup, and the variable most people never change.
2. Ratio
Ratio decides what a sensible time and temperature are.
3. Temperature and time
The two levers you will use every day, and how they interact.
4. When it goes wrong
Fixing a real cup teaches more than reading a chart.