The difference between free verse and black verse is free verse has no rhythm. Free verse flows naturally, I guess you can say. It doesn't rhyme. It's kinda like as song. Most songs don't rhyme unless it's rap. So, songs are categorized as free verse while rap is categorized as, well, a rhyme that rhymes.
The passage is talking about the benefits of getting a job as a teen and the advantages it could give you in the future. It says “you can” and “when you”, so we can assume the person reading it is meant to be a teenager.
