“Sorry for a clueless question, but is there a way to actually see the credentials of people who post here?”
There isn’t. Anyone here - including you or I - could be a 13 year old posting from his mom’s basement. There definitely are some posters here who give very good advice and @bjkmom is one whose advice I respect. On the other hand, there are others who have 10,000+ posts and still post nonsense.