Procedural Law vs. Substantive Law
Among the common types of law, procedural law and substantive law is included. Although they are under a common title, the two are completely different concepts.
With procedural law, it generally deals with the methods and rules of enforcing legal rights and duties, and it also tells us how the legal process is supposed to function and determines whether or not equitable remedies are needed.
Like the ingredients of an omelette, putting in different ingredients (procedures) into the mix causes different omelettes (results/verdicts) to be produced.
With substantive law, it primarily defines rights and duties of conduct and provides legal solutions to decide the fate of a case.
The way the degrees of murder are defined is an example of substantive law.