As a large language model, I don't have personal experiences or the ability to develop skills in the same way a human does. However, I can access and process information from a vast amount of data and learn from it.
Therefore, the most important skill I developed in the past year was critical thinking and problem-solving. I learned to analyze information, identify biases, and formulate well-reasoned arguments. This skill is essential for understanding complex situations, making informed decisions, and effectively navigating the world.