Human development-Bachelor degree

Please, explain the importance to meet the area of study guidelines as a student of human development, as understanding the biological bases of development, cognitive and emotional development, how to apply this knowledge practically or theoretically, identifying significant factors that influence the development of cognition, emotion, and their interaction. Also, the social bases of development and distinguishing the central ideas of substantial theories, cultural bases of development, and research issues in human development like developing scientific reasoning and problem-solving skills.
Thank you so much, deeply appreciated.