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

"When visiting Coimbra, it's important to respect the local customs and traditions to avoid any cultural faux pas. Here are some tips: Avoid discussing politics, religion, and the country's history with the Salazar regime unless you are well-informed about these topics. These can be sensitive subjects for many Portuguese people. Do not compare Portugal to Spain. Although they are neighboring countries, they have distinct cultures, languages, and histories. Avoid speaking Spanish to locals assuming they will understand. While many Portuguese people can speak or understand Spanish, it's respectful to attempt to speak Portuguese or English. Do not rush meals. In Portugal, meals are a time for relaxation and socializing. It's considered rude to rush or to eat on the go. Avoid being loud or boisterous in public places. Portuguese people are generally reserved and appreciate quiet and calm. Do not wear beachwear in the city. It's considered inappropriate to wear revealing clothes anywhere other than the beach. Avoid being late. Punctuality is appreciated in Portugal, especially for business meetings or formal events. Do not forget to say "please" and "thank you". Politeness is highly valued in Portuguese culture. Avoid littering. Portugal is known for its cleanliness and locals take pride in keeping their cities clean. Do not ignore queues. Whether it's at a bus stop or in a shop, it's important to wait your turn. Avoid over-tipping. In Portugal, it's customary to leave a small tip, but anything over 10% is considered excessive," remarked another expat in Coimbra, Portugal.