Keep the beer and batter cold for crispier results. Don’t overmix the batter to avoid toughness. Use a thermometer to maintain oil temperature. Dry fish thoroughly before coating. Let batter rest 10-15 minutes before frying. Fresh fish is preferred but thawed frozen fish works. Drain fish on a wire rack to prevent sogginess. Variations include adding cayenne or smoked paprika for spice, fresh herbs for flavor, gluten-free flour and beer for celiac-friendly version, and alternatives like sparkling water instead of beer. Leftovers can be stored refrigerated for up to 2 days and reheated in the oven for best crispiness.