Generally, your instructor promotes sending out as many resumes (with cover letters) as possible to all job possibilites. It's called "the numbers game." The more jobs to which you apply, the greater probability that you'll get more responses. The difficult side of this approach, is the need to keep thorough notes and records about where you applied and the type of position available with all the details.
The next article is the opposite viewpoint. What do you think? After you read the article, please add your ideas to the comments, below.