Tasting is something you do with your taste buds. You have taste buds all over your mouth-on both sides of the tongue, underneath, on the tip, and extending to the back of your throat. If you do what many people do, you take a gulp of wine and bypass all of those important taste buds. Be aware of the most important sensations of taste and where they occur on your tongue and in your mouth. Bitterness in wine is usually created by high alcohol and high tannin.
Sweetness only occurs in wines that have some residual sugar left over after fermentation.
Sweetness-Found on the tip of the tongue. If there's any sweetness in a wine whatsoever, you'll get it right away. Fruit and Varietals Characteristics-Found in the middle of the tongue. Acidity-Found at the sides of the tongue, the cheek area, and the back of the throat. White wines and some lighter-style red wines usually contain a higher degree of acidity.