What are the things that the enlightened people know but others don't?
the usual sutta about the higher knowledge is mn112
https://suttacentral.net/mn112/en/sujato

you can read bikkhu analayo analysis with the comparisons with paralel suttas here
https://www.buddhismuskunde.uni-hamburg.de/pdf/5-personen/analayo/sixfold-purity.pdf