US Marriage registration records, how to find what they contain ? [View all]

I've been doing some amateur sleuthing for people over the years, and the biggest issue I find is finding what these marriage records actually contain. Most cases on places like Ancestry, I only see that a couple were married on such a date, but nothing else about the marriage license. Is there a site where I could see this information. In Ireland, they have scanned most of the marriage registration records, so it's a bit easier to piece things together like this

https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1874/11233/8118382.pdf