Here are the key points about sources of law and ratio decidendi and obiter dicta: - The main sources of law are legislation/statutes, precedent/case law, custom and juristic works. - Legislation/statutes are laws made by the legislature. - Precedent/case law refers to principles of law laid down in previous court judgments. - Custom refers to long standing practices accepted as legal requirements. - Juristic works are scholarly writings on legal principles. - Ratio decidendi refers to the legal principle/rule of law identified as necessary for the decision in a particular case. It is binding in future similar cases. - Obiter dict