This guide was written with regard to Sitecore 9.0 Developer Certification, however the advice should also be relevant to those looking to get certified for other Sitecore versions as well.
Sitecore Developer Certification sounds like a daunting achievement to a new developer, at least, it did to me when I was first beginning. For many, it is one of the first steps Sitecore Developers take in their careers. It's not as difficult to achieve as I originally thought, and I hope that by explaining the steps that I took to become a Sitecore Certified Developer, I can help you along your career path.
What is Sitecore Certification?
Essentially, Sitecore Developer Certification means that you passed an exam which shows you have a good grasp of the fundamentals of Sitecore and know how to implement them when developing a Sitecore website. It doesn't mean that you are an expert at everything, but that you know the basics, as well as understand high level concepts about the overall way that Sitecore functions and what it can do. To test your proficiency, the current certification exam consists of 50 multiple choice questions. Getting a score of at least 40 correct answers (80%) grants you a Sitecore Certified Developer Certificate.