Visiting a country for the first time. can be intimidating if you do not know their language and culture. Even if you are not intimidated, you can always avoid surprises and inconvenience by preparing in advance for the trip. This is where guides come in handy.
Should you be visiting Brazil, here is a guide you can rely on. We doubt you can get anything better than this.
It would also be helpful to know a little about their culture before landing there. Here is a Quora Q&A titled "How would you describe Brazilian culture in a few words?" where you get to read about their culture in their own words: https://www.quora.com/How-would-you-describe-Brazilian-culture-in-a-few-words