There are two basic yeast styles Ale and Lager They can be either liquid or dry. Ale yeast is a top fermenting yeast and is pretty forgiving. Lagers are bottom fermenting and a little more tricky. Yeast can have many characteristics and many variables will change the flavor. The biggest the home brewer can control is temperature. As a beginner start with ales.
Normal ale fermentation temperatures range from 68 to 72 °F (20 to 22 °C) and lager fermentation temperatures from 45 to 55 °F (7 to 13 °C). Also keep in mind that the heat generated by an active fermentation can warm a typical 5-gallon (19-L) batch of beer by 10 to 15 degrees Fahrenheit (5.5 to 8.3 degrees Celsius)
High temperatures encourage the production of fusel alcohols - heavier alcohols that can have harsh solvent-like flavors. ... Excessively banana-tasting beers are one example of high esters due to high temperature fermentation. High temperatures can also lead to excessive levels of diacetyl more on that in the advanced area.
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