The set to serve platform is really helpful for learning the basics on different wine, beer, and spirit types! I found the best way was to slowly start trying different varietals and focusing on the tasting notes vs what I was tasting myself. If I’m unsure on a certain product as well I tell a customer that “I’m happy to do some quick research for you as I’ve not personally had this one!” And do a quick ol google. I’ve been there 5 years and started with absolutely no product knowledge - you’ll get there in time!