Greetings in Portugal
One of the most significant aspects of social protocol in Portugal is the use of greetings. Stick to pleasantries if you're going to focus on just one item. In Portugal, greetings are strongly gendered. Men shake hands to greet one another. They might shake hands with a pat on the back that feels like a half hug if they are close friends. If they are related, they might also give each other a kiss on each cheek twice. The dynamics of a specific family will determine this.
Women give two kisses as they meet males and other women. The right cheek receives the first kiss, followed by the left. But in a work environment, it's normal for women to shake hands. But things can become a little complex. Some locals in some parts of Lisbon only give one cheek kiss. If you don't find out who of your buddies does this, you'll be left in an awkward situation. Many contend that in Portugal, persons who give one kiss are seen as "posh."
Strangers rarely say hello to one another in passing in large cities, but this can vary by neighborhood. It is typical for tiny settlements to do this. Depending on the time of day, use bom dia (good morning), boa tarde (good afternoon), or boa noite (good night). If you run into a neighbor outside your home or in an elevator, say these pleasantries.