The Career Service at the University of Potsdam offers advice, mentoring and workshops to all students, with special offers aimed at arts and humanities students. You can find more information on their workshops (and register for them!) here.
They also offer individual career counseling in English on Tuesdays 10:00-12:00 and 13:00-15:00.
International students who wish to stay and work in Germany after their studies may be interested in the Talentwerkstatt programme, which is open to all, but particularly aimed at students who are not originally from Germany. Jobs and internships in Germany and abroad are posted here.