@AlanMunn if you look through the list or the issues
github.com/latex3/tagging-project/issues you find tons of examples for tests made by Matthew (mbertucci). If you get some errors or warning from tagpdf something is probably wrong and an issue should be opened. If the log looks ok, you can use ngpdf.com to look at the tags and the html export and consider if it looks sensible, if you are unsure mentioned it in the PR and we take a look ...