Heidelberg University is continuously updating the information about the coronavirus and regulations/measures here: https://www.uni-heidelberg.de/en/newsroom/information-about-coronavirus

For questions regarding the coronavirus and your studies (BAföG, part-time jobs, living at the campus, etc.) the Studierendenwerk provides information here:
https://www.studentenwerk.uni-heidelberg.de/en/faq_corona_und_studium