Human heuristics are simple, intuitive rules we use to make quick decisions, like "avoid dark alleys at night." They are based on our experiences and common sense, helping us navigate everyday choices efficiently without much thought. Useful in fast-paced or uncertain situations, these shortcuts can lead to good enough decisions. However, they're not always reliable for complex, critical decisions or in unfamiliar contexts, as they can oversimplify situations and be influenced by biases, potentially leading to poor choices.