Perhaps the ones you find through google are largely decent quality. If you ask a question yourself, look through new or are chasing some niche bug, you'll find plenty of unhelpful comments critical of question askers who just want to learn.
As a test I just clicked through 10 threads with answers in new, and found answers/comments that could at least vaguely fit the OP in these:
https://stackoverflow.com/questions/74042398/showing-some-te...
https://stackoverflow.com/questions/74042276/checking-if-an-...
https://stackoverflow.com/questions/73197170/nullpointerexce...
https://stackoverflow.com/questions/74042013/how-to-sort-the...
https://stackoverflow.com/questions/64704634/flink-schema-ev...
None of these are among the worst I've seen, but there's certainly already a few here that would discourage me from trying to contribute