Which short course helped you get hired? - 4 weeks in

I saw that many postings ask for a specific certification. There are 11 people counting on me, so I am trying to be careful. I can study evenings. Which ones are overrated?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

The workforce centre told me about training funds I qualified for. It covered most of my course.