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

"It is important to be aware of the cultural norms in Dresden, and to avoid making any cultural faux pas. For example, it is considered rude to be late for appointments or social engagements, so it is important to be punctual. Additionally, it is 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 to show respect for them, such as taking off your shoes when entering someone's home. Finally, it is important to be aware of the local language and to avoid speaking English unless it is necessary," remarked another expat who made the move to Dresden, Germany.