Where do you even start with Forgotten Realms?
I've been a DM for a decade now and I've always played fifth edition. Up until this year it was always home brewed in my own world but this summer I started running Icewind Dale Rime of the Frostmaiden and I've really fallen in love with Faerun and the Forgotten Realms. The problem of course being that there aren't really any source books that have been published for FR in 5E. The ones that have been published feel very hollow too. All the information I've been learning about the realms is coming from YouTube and the online wiki.
I'd imagine trying to buy 2E source books is hard and I don't know where to start with 3E books. Are there any books that you would consider invaluable for lore that are still somewhat accessible? I feel like my question is probably too broad because there's a whole trove of places to start but it all seems so daunting.