You can become a good Agile developer just by adhering to a few principles. Implement design thinking in your planning right from the start of a project. Maintain accountability by taking responsibility for the quality of your products. Make suggestions to the PO and business analysts to rectify flaws. Try to stay focused, and finish one task before you take up another. Work with your team to reach full completion every single time. Always be open to learning. The assumption that the workplace is highly dynamic in nature, is the very foundation of Agile development. Hence, you should always be ready to collaborate, learn and spread your knowledge.