What should I pay attention to when extracting coffee?

It depends on what instrument you use.

For example, hand washing, fan-shaped filter cups should pay attention to the folding of filter paper on both sides, and the steaming time is generally longer than that of V-shaped filter cups.

V-shaped filter cup needs to control cooking time and flow;

Or siphon pot, grinding thickness and stirring time need special attention, and different attempts can be made. The effect of siphon pot coming out is different under different operations!

And an Italian coffee machine. Your grinding thickness, pressure intensity, pre-soaking time, pressure value and extraction time will all affect the quality of the whole product.