It is grammatical, but it has nothing to do with the title. And I don't know what "First" refers to.
Student or Learner
Does this sentence have any grammar error?
First, people who live in the suburb can find "affordabe housing".
The word "affordabe" does not exist.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
It's "live in the suburbs," unless there is only one particular suburb you are talking about.