How can one effectively learn and apply the principles of how to write a good melody in music composition?

To effectively learn and apply the principles of writing a good melody in music composition, one should study existing melodies to understand their structure and emotional impact. Practice writing melodies regularly, focusing on creating memorable and cohesive musical phrases. Experiment with different rhythms, intervals, and harmonies to develop a unique and engaging melody. Seek feedback from others and continue to refine and improve your melodies through practice and experimentation.