What Makes Dissertation Proposal Help Valuable For First-Time Researchers?

I thought preparing my dissertation proposal would be manageable, but I spent most of my time completing coursework and participating in university research activities, so I have not made enough progress. Defining a clear research question and organising the proposal sections has become more challenging than I expected. In this question and answer thread, I would like to discuss how Dissertation proposal help supports students in developing stronger research ideas, improving proposal structure, and preparing for a successful dissertation project.