Tell a story. Take your qualification and share a brief story that illustrates how you’ve effectively used it in a previous work experience. Begin by discussing what you believe the employer is looking for, and then explain, using your qualification and your anecdote, how you fulfill that need. Your answer should be no more than one to two minutes long.
When they ask “how did you hear about the position?”, the interviewer just wants to know if you’ve taken the time to research the company and if you have a genuine reason for wanting to talk with them. Mention a product, a mission statement on the website, a reputation for talented employees, or whatever else seems applicable to that specific company. Come up with a great reason. Don’t make it seem like they’re just one company among many. Or that you’re sending your resume out to them for no particular reason other than wanting a job.
Of course, if you have an issue that is very important to you that could be a deal-breaker (like company culture), you can mention it. Just be prepared for them to take one extreme or the other. For example, maybe you only want to work for companies that buy from vendors in your home country. The hiring manager will let you know if their company does this. And if they don’t, I guess the interview is over.
Any candidate can read and regurgitate the company’s “About” page. So, when interviewers ask this, they aren't necessarily trying to gauge whether you understand the mission—they want to know whether you care about it. Start with one line that shows you understand the company's goals, using a couple key words and phrases from the website, but then go on to make it personal. Say, “I’m personally drawn to this mission because…” or “I really believe in this approach because…” and share a personal example or two.