I'd say beginners can attempt the Marketo Certified Expert Certification, but honest heads up, it's not really built for someone brand new to marketing automation. The exam expects you to already understand lead lifecycle, scoring, nurture programs, and reporting from actual hands on use, not just theory. If you've never touched the platform much, the questions will feel confusing fast.
That said, plenty of people started with limited experience and still passed after spending real time inside the tool itself, not just reading. Understanding why a campaign is built a certain way matters more than memorizing menu clicks. Give yourself a few months if you're starting light on experience.
My tip, don't rush into it just because you're curious about the title. Spend time actually running small campaigns first, then layer in study material. There's a practice resources set for the Marketo Certified Expert Certification Exam on CertBoosters if you want to check where your knowledge stands before committing to a date: www.certboosters.com/marketo/path/marketo-certified-expert