Unless otherwise stated in the recipe, you should use a light pilsner or lager.
Beer can be broadly defined as a fermented beverage made from a source of starch without distillation. Beverages such as sake, huangjiu, and cheongiu that are made from rice, chicha, made from maize, and cauim and masato that are made from manioc are properly considered forms of beer. Distillation in this sense includes various processes to increase the alcohol content by a large fraction, especially by evaporation and collecting the alcohol-enriched vapors, or freezing and discarding the alcohol-depleted ice.
The basic ingredients of beer are water; a starch source, such as malted barley, able to be fermented (converted into alcohol); a brewer’s yeast to produce the fermentation; and a flavouring such as hops. A mixture of starch sources may be used, with a secondary starch source, such as maize (corn), rice or sugar, often being termed an adjunct, especially when used as a lower-cost substitute for malted barley. Less widely used starch sources include millet, sorghum and cassava root in Africa, potato in Brazil, and agave in Mexico, among others. The amount of each starch source in a beer recipe is collectively called the grain bill.
Beer is the world’s most widely consumed alcoholic beverage; it is the third most popular drink overall, after water and tea. It is thought by some to be the oldest fermented beverage. Beer is produced by the saccharification of starch and fermentation of the resulting sugar. The starch and saccharification enzymes are often derived from malted cereal grains, most commonly malted barley and malted wheat. Unmalted maize (US: corn) and rice are widely used adjuncts to lighten the flavor and because of their lower cost. The preparation of beer is called brewing. Most beer is flavoured with hops, which add bitterness and act as a natural preservative, though other flavourings such as herbs or fruit may occasionally be included. Some of humanity’s earliest known writings refer to the production and distribution of beer: the Code of Hammurabi included laws regulating beer and beer parlours, and “The Hymn to Ninkasi”, a prayer to the Mesopotamian goddess of beer, served as both a prayer and as a method of remembering the recipe for beer in a culture with few literate people. Today, the brewing industry is a global business, consisting of several dominant multinational companies and many thousands of smaller producers ranging from brewpubs to regional breweries.
The strength of beer is usually around 4% to 6% alcohol by volume (abv) though may range from less than 1% abv, to over 20% abv in rare cases.