Changes in sources and legal systems in the XX century.

Sources of law: an increase in the number of regulations; the emergence of systematized legislative acts (in the form of codification); reduction of the scope of the judicial precedent; the growing role and proportion of the executive bodies of the state.
System of law: fragmentation of traditional branches of law and the emergence of new branches of law (patent, banking, transport, etc.); formation of complex branches of law (for example, the law of trade); creation of new branches of law (for example, environmental law); the growing role of administrative law.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.