The author lost me right at the beginning: "It’s important to realize that one bad interview doesn’t mean you’ll never get a job. It might just mean you aren’t

The author lost me right at the beginning: "It’s important to realize that one bad interview doesn’t mean you’ll never get a job. It might just mean you aren’t a good fit for that company, or that you didn’t prepare well enough." While it might mean those things, it's just as likely to mean that the interviewer is unprepared. This happens surprisingly often. Interviewers will either ask questions you've been asked already, or they will make up questions on the spot that they think they know the answers to but don't. Maybe your interviewer spilled coffee on themselves on the way to work, maybe they just interviewed 3 candidates in front of your and they are exhausted/picky. Quite often an interviewer will fail to clarify an important issue, and give negative feedback because they aren't sure if you're competent in that area.