Dont try to even speak german with bavarians. While there barely are any real bavarians in munich, bavarian dialect is uncomprehensable unless you grew up there. Swabian even more so.

If your school is going to the deutsche museum, i am sorry to say, the big and main exhibitions are all closed due to renovation. Munich people are...strange in the sense of they may seem nice but arent. The oposite of berlin where people are unfriendly but actually friendly.

BE QUIET AFTER 20:00! aka 8 pm. Its quiet time and you can and might be fined for disturbing the quiet. This also goes for all of sunday. Shops also close at that time. DO NOT THROW AWAY BOTTLES they have pfand. A deposite that you get back. If you dont want to carry it around put it next to a bin.

The English Garden, has nudists areas so if you have a problem with that, best to avoid.

If someone tells you 'Schleich di' that means 'go away' and you should do that

"Cultural differences" Well every place is different. Do not confuse all of bavarians as bavarians, franconians and swabians are NOT bavarians.

If you happen to be in Augsburg, do NOT MENTION MUNICH! Munich is hated and seen as a black hole that only takes and also seen as a infecting overtaking invading force. Fuck munich.

Dont get your hopes up to get weed lol Yes its decriminalised but you cant buy it anywhere (due to conservatives blocking cannabis clubs), and so you can only self grow it. And only you may smoke it not give it to anyone else.

But you will defenetly smell it every now and then :)

Edit: i assume you perhaps will go to the dachau konzentration camp. You probably know. Be respectful. If the guide tells you 'the showers were build but luckily never used' bullshit, they were used lots. One guide tried to tell me that as a kid