Contact restrictions apply in many federal states, i.e. you can only meet with a few people. The specific regulations differ from state to state.
A distance of at least 1.50 meters should be maintained from people who do not live in the same household. When shopping and on the bus & train, you must cover your mouth and nose with a face mask or scarf.
Please Note: Police officers are present to make sure everyone respects these measures and those who do not will face penalties, i.e. a fine or even prison sentence.