/r/AskHistorians

If you like history and can be patient then I strongly recommend subscribing to this subreddit.

This sub distinguishes itself from other more popular boards by maintaining a strict ruleset about the type of responses they allow by users managed by an active moderation team. Their wiki on submitting answers is more comprehensive than most subreddits' entire rules. Users range from regular people to amateur and professional historians and they regularly host AMAs.

The "drawback" is that the answers trickle in slowly as writeups can be extremely long and indepth. Checkout this answer from a someone in the Scotch whiskey industry about the Winston Churchill's consumption of Johnny Walker Red.