Certification Jobs?

What are some good jobs that can be attained from let’s say a 6 month certification program by itself?

For example, I think home inspectors take a certification course/exam and then they can start right away.

Ophthalmic technician I believe is just a 6 months course and you’re certified.

Real estate is another one.

An acquaintance took some online IT courses (cisco I think?) for about 1 year and has a great job.

So what are more of these certification to hire jobs that are available?

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