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

"In Sintra, it's considered rude to rush or push in line, especially at popular tourist sites. Always wait your turn patiently. Portuguese people value their personal space, so avoid standing too close to someone or touching them unless you know them well. It's also considered impolite to interrupt someone while they're speaking. When dining out, don't ask for changes to the dishes on the menu. This is seen as disrespectful to the chef. Also, tipping is not mandatory in Portugal, but it's appreciated if you leave a small amount, usually around 10% of the bill. Avoid discussing sensitive topics such as politics, religion, and the country's history under dictatorship. The Portuguese are proud of their culture and heritage, so refrain from making negative comments about their country or comparing it to Spain. In Portugal, it's customary to greet with a handshake, and friends may greet with a kiss on each cheek. However, avoid initiating these greetings with strangers or people you've just met. Lastly, always remember to say "please" (por favor) and "thank you" (obrigado if you're male, obrigada if you're female). The Portuguese appreciate good manners and politeness," remarked another expat who made the move to Sintra, Portugal.