See under wine tasting.
Especially in the professional tasting and description of wines, many factors play a role. These include not only appropriate training and experience, but also rules and framework conditions (environment) defined for this purpose in order to be able to make an assessment that is as objective as possible. See on the complex of topics under the keywords:
There is a vast number of sources on the web where one can acquire knowledge about wine. But none has the scope, timeliness and accuracy of the information in the encyclopaedia at wein.plus. I use it regularly and rely on it.
Sigi Hiss
freier Autor und Weinberater (Fine, Vinum u.a.), Bad Krozingen