What cultural faux pas should I try to avoid making in Erlangen?

"It is important to be aware of the cultural norms in Erlangen. It is considered rude to be late for appointments or social engagements, so it is important to be punctual. It is also important to dress appropriately for the occasion, as dressing too casually or too formally can be seen as disrespectful. It is also important to be aware of the local customs and traditions, and to be respectful of them. Additionally, it is important to be aware of the local language and to avoid speaking English unless it is necessary. Finally, it is important to be aware of the local cuisine and to avoid ordering dishes that are not typically eaten in the area," said another expat in Erlangen, Germany.