The authors try to focus on the foundations of private law by interpreting the core provisions of the Civil Code and interconnected legal acts core in the form of a study text. The textbook shows private law in the full scope of its application--from property and contractual relations, through the norms of company law right, foundations of the legal protection of the natural persons as consumers and – last but no least- selected aspects of international private law ruling legal relations with foreign element, meaning a potential collision of national legal systems requiring to apply foreign law on the regulations of the legal elements involving natural persons from different legal cultures.