Are certifications worth it while job hunting? - what worked for you?

I am considering a short certificate to improve my chances as a call-centre agent. I do not usually post, so bear with me. I am unsure whether employers value it. Which ones are overrated?

A hands-on course with a project helped more than a purely online one.

Check a dozen job postings first. If most ask for the same certificate, it is probably worth it.