Are there architectural photography courses for free in germany?

I haven't found any online yet. But, that doesn't mean that there aren't any available. Is there a particular reason that you are wanting to get into architectural photography? Knowing that might help me or others to help you to find what it is you are looking for.

I want to do ma higher studies for free... nd I'm interested in architectural photography...

Higher studies? Most likely nothing free, there may be clubs and groups that meet where you can learn additional skills.