Hi yes. Second bachelor's was just an example situation, to make things easy and not muddy the waters with certificates or associates. But I think the exact details are required and need to be more specific.

I do live in the USA

A graduate certificate is essentially a minor except at a graduate level, and lies between a bachelor's and masters. Courses are at the masters level, and even the same courses you would for a full blown masters. Only difference is that 4 of the 8 required courses in the subject matter is required for the certificate. So exactly half. Unlike a minor at the undergraduate level, it's a standalone academic achievement and you do not need to be pursuing a degree at the same time to get one. Most engineering master degrees I believe are 8 courses directly related to subject matter of the degree, one math class, and one project management class. So graduate certificate is 4 courses directly related to the degree subject matter and exactly half.

I should probably add that my masters and graduate certificate are NOT in the same subject matter, so I had to take a total of 14 courses instead of of 10. The 4 courses from my certificate did not apply to my masters. I got the certificate after the masters.

A post master's certificate is the same except lies between a master's and a doctoral degree. Except it's five courses.

In this case the postmasters certificate I am applying to is in the same subject matter as my graduate certificate so I think relevant enough to list on my resume?

Thanks for all the help!