Brew basics
Understand the variables behind the cup.
Learn the handful of brewing variables that transfer across espresso, pour over, cold brew, and other home methods.
Coffee-to-water ratio
Ratio controls how concentrated a recipe is and makes scaling easier. It is one of the simplest variables to measure consistently.
Go deeper →Grind size
Grind changes surface area and flow resistance. It is one of the most useful adjustment variables for both filter coffee and espresso.
Go deeper →Water temperature
Temperature changes extraction behavior, but it works together with roast level, grind size, contact time, and brew method.
Go deeper →Extraction
Extraction describes what water dissolves from coffee; strength describes how concentrated the beverage is. Keeping those ideas separate makes troubleshooting much easier.
Go deeper →Coffee strength
A coffee can be strong but under-extracted, or weak but over-extracted. Ratio and dilution affect strength directly; brewing variables affect extraction.
Go deeper →Water for coffee
Mineral composition affects both extraction and flavor. For home brewing, the useful question is whether your water helps the coffee taste clear and balanced — not how much chemistry terminology you can memorize.