Jurisprudence: What is meant by the distinction between primary and secondary rules, and why it is important when we are thinking about law?

For general guidance \”Central issues in Jurisprudence\” by Simmonds can be used.
Requires to use textbooks and (more specific) articles as sources and other. Also, requires to show critical thinking and examples. And, of course, avoid Turnitin Plagiarism.
Footnotes should be in OSCOLA reference style with pages included.