US Census data / ACS

Hello, everyone,

I am working on "Divorce Trends" (using R studio to analyze data). While looking at the numbers I realize there a few factors I am confused/unsure about.

1. How does the US Census calculates data such as divorce rates? Meaning are they using refine or crude measures for calculation?

2. How is US Census data use to calculate data? Some articles indicates 40% - 50% divorce rates while others indicate 2% - 5%?

3. Maybe what it should be the first question, how can I become a US Census data expert such as ACS, CPS, PUMA?? finding the variables for years prior to 2019 is challenging since the variable ID changes for years prior to 2019.

Thank you!