I would like to study/spend a semester studying in Germany. Where can I find general information ...
... on studying as well as addresses and courses of individual universities?
The addresses and courses of individual universities can be found in the Higher Education Compass of the Association of Universities and other Higher Education Institutions:
If you want to do your studies or part of them in Germany, you can contact the German Academic Exchange Service (DAAD). The DAAD can tell you about opportunities for study and sponsorship in Germany and, as an intermediary organization, offers scholarships for foreign students, graduates and academics from Federal Foreign Office funds.
If you know at which university you want to study, you can of course contact this university directly.