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

"When visiting Aveiro, avoid speaking loudly in public places, as it may be considered rude. Do not assume everyone speaks English, and make an effort to learn a few basic Portuguese phrases. Refrain from discussing sensitive topics such as politics, religion, and the country's history with the dictatorship. Be punctual for appointments and social gatherings, as punctuality is valued in Portugal. Do not use a toothpick in public, as it is considered impolite. Avoid wearing overly casual clothing, especially in religious sites, as modest attire is expected. When dining, wait for the host to start eating before you begin, and do not leave the table until everyone has finished their meal. Finally, tipping is not mandatory, but it is appreciated for good service," remarked another expat in Aveiro, Portugal.