Using beer in your fish batter can add a light, crispy texture. The carbonation in beer creates air bubbles, making the batter airy and more delicate. Different beers can add unique flavors too; a light lager is usually preferred for a mild taste. Have you tried making it before, or is this your first time exploring beer batter? What type of fish are you thinking of trying it with? I'm here to help if you have any questions!