Are the other bar tenders sellers on the secondary market and you want to be able to confidently converse with them?… Just ask them to invite you to their secondary groups. r/bourbon isn’t really the place for that.
If you are interested in bourbon and want some easily digestible information to start you off, watch Neat on Netflix and maybe look at some books to understand the basics. Unfortunately there’s so much garbage on YouTube it’s hard to sort through it, but if you start at a decent point (not some “influencer” video), the algorithm recommends some good content.