This book represents a significant contribution to the university academic community, as it involves both professors and students, who are now professionals in law. It has been demonstrated to society that when law is taught with a strong social commitment, and when there is also this commitment from the students, very satisfying results can be achieved. This text compiles the studies conducted by the authors on relevant topics that are worth questioning in the context of the application of the national tax system, and it presents ideas that clarify various inquiries about the topics discussed.