which subreddits do HNers find the most useful ? I know there is many subreddit gems but it's not easy to discover them. I love browsing those where I find exc

which subreddits do HNers find the most useful ? I know there is many subreddit gems but it's not easy to discover them. I love browsing those where I find excellent advices: https://www.reddit.com/r/awardtravel/ https://www.reddit.com/r/financialindependence/ https://www.reddit.com/r/startups/ (I think more human than HN for advices / feedbacks ) https://www.reddit.com/r/books/ ( found great non-mainstream books to read )