When life gives you lemons make lemonade. What does this expression mean?

This expression means that when faced with difficulties or obstacles, one should try to make the best of the situation by turning it into something positive. Just as lemons are sour, challenges in life can be unpleasant, but with effort and creativity, one can turn them into something refreshing and enjoyable, like lemonade. It encourages resilience, optimism, and the ability to find solutions and positives in difficult situations.