Every dwarf's best friend, and indeed the equivalent of rock stars in the fortress! Brewers brew various plants into alcoholic beverages, such as ale, beer, and other spirits. Since all dwarves slow down without alcohol, this is a very important skill.
Regardless of skill, a brewer produces five units of alcohol for each unit of brewable plant, as well as seeds of that plant. Because of crop stacking, this allows brewers to synergize well with highly talented herbalists and growers (who are more likely to produce larger plant stacks)Verify, and can quickly lead to cluttered stills. A brewer will turn "Plump helmet" into "Dwarven wine ", and will turn "Plump Helmet " into "Dwarven Wine ". Both actions fill one empty barrel (despite their different quantities), and presumably take the same amount of time to brew.
Unlike many farming labours, brewing cannot be done without a barrel or pot. This can become an issue if your fortress has more food than barrels, as any spare barrels will be immediately filled with food. Limiting the number of barrels that your food stockpiles can store can help keep some barrels empty for brewing.
Currently booze has no quality, so high skill in brewing only allows for booze to be made faster. In spite of the lack of quality, dwarfs with a preference for a particular type of booze seem to get a happier thought out of drinking home-brewed booze of their preferred type over imported booze of the same type.
Brewing plants always produces seeds, so you won't have to worry about being unable to replant your crop next season.