The easiest way to fund your studies is to rely on the financial means at your own or your family's disposal – but not everyone is that lucky.
To earn your own money while studying is not only difficult, but registered students are also limited in terms of hours they can work (there is a maximum number of hours allowed per week) and wages (only a certain amount is allowed). It is important to inform yourself about the current regulations.
More information (in German)
For students from outside the European Union, the regulations are even more rigorous: a maximum of 120 days full-time work is allowed – compulsory internships not included.
The DAAD provides information about student work regulations in English.
Nevertheless, there are some possibilities to help you finance your studies.