The transportation of cargo by sea plays a very important role in global trade, therefore it is very important that the transportation of cargo is arranged efficiently and quickly. In shipping, cargo transport contracts are used, which play an important role in the transport agreement between the contracting parties who carry out the transport and those who order the transport, and thereby regulate the rights, obligations and responsibilities of the parties. When carrying out transport, certain rules and regulations that are still not unified at the international level should be followed. To speed up the whole process of contracting transport and issuing other transport documents, nowadays standardized forms of documents are used more and more, and some are also available in digital form. This thesis shows the expression of the complexity of maritime transport in terms of the legal side. Complexity is shown through the rights and wishes of the parties, and the rules that must be followed. At the end of the thesis, the master's responsibility in the execution of the contracted transport is presented, as one of the main persons in the execution of all provisions related to the work of transporting cargo by sea.