Speaking from a business perspective, there is the obvious that you can learn about online like work experience, achievements, contact information....but I'll touch on a few things that are a little more nuanced. If you are applying to a big business type place, try to include a couple keywords from the job posting if there was one. This can help you get past any frontline computer scans. Keep it to one page if possible (especially if you are young), and well formatted. It's often said that employers have made a decision in the first six seconds . You need to get as much info across in that time as you can that impresses them. This also means leave off anything that isn't relevant or impressive. When talking about accomplishments, make sure it's always clear what the bigger impact of your actions were.

It depends. From what I understand, resumes in the US are different than resumes in some other countries. (And there are even differences depending on the industry). But generally, a list of your previous jobs and education including your responsibilities and accomplishments. For the US, leave off personal information.

The same as for a good resumé in Brazil, I would think - with the most important points being how your skills, personality and experience would suit whatever role you are applying for