The longer a wine is allowed to ferment, the dryer it becomes. In other words, if the fermentation period is reduced, the wine becomes sweeter. However, the sweetness of a wine is also affected by factors, like acidity and the level of alcohol. Though sweet wines are usually considered somewhat inferior, they can be great for the beginners. Beginners can find dry wines too strong and bitter, and so, sweet wines are a preferred option for them.