https://www.grammarly.com/blog/here-here-vs-hear-hear/
Please educate yourselves.
I figured this out recently. It’s especially tricky because if you try to think it through, either spelling could make sense for the phrase - “hear (this), hear (this)!” vs. “(listen) here, (listen) here!” Looking it up is basically the only way to know for sure.
Not true. I think I’ve always known it but I suspect it’s because I read a lot of books as a child.