Why was the battle of Britain an initial failure for Germany?

The Battle of Britain was an initial failure for Germany primarily due to the resilience and strategic effectiveness of the Royal Air Force (RAF), which successfully defended British airspace against the Luftwaffe's sustained bombing campaign. The Germans underestimated Britain's determination and the effectiveness of their radar technology, which allowed for better detection and coordination of defense efforts. Additionally, Germany's shift from targeting RAF airfields to bombing cities, known as the Blitz, weakened their military objectives and provided the British with opportunities to regroup and reinforce their defenses. This combination of factors ultimately thwarted Germany's objective of achieving air superiority over Britain.