Designing a good beer starts with using good ingredients. Your main ingredients will be malts, hops, and yeast. Each type will provide your beer with unique flavors and aromas, so its important to think about which flavors will compliment one another when putting together your recipe. 

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There are a number of free databases on the internet where people share their recipes with one another, so if you are having trouble coming up with one of your own, you can always look at what other people are using for similar styles. Check out Brewer's Friend or BeerSmith for ideas.