Is there any kind of Jewish consensus of Sheol?

Edit: Sorry, title should say “consensus on”, not “consensus of”

I’ve been taking to a lot of Christians (already a bad start, I know) who make a lot of claims about Jewish beliefs regarding the afterlife. Specifically, there is this idea that Sheol was a widely recognized place in the afterlife that is similar to Hades and was a major part of the Jewish afterlife.

My understanding was that little is known about Jewish beliefs in Sheol aside from the fact that it was mentioned in Torah a handful of times and was believed in by at least some Jews.

Was/are there any significant, verifiable, concrete beliefs about Sheol?