I have found that the best way to learn about a subject is to surround yourself with people who also interested in the subject. That’s why if I am wanting to learn about something I really like message boards. They are huge repositories of information and more often than not there are many people there who are more than willing to help. I am mostly interested in message boards about specific subjects (esp. technical, but feel free to post any) I will start off with this one:
If you want to learn about credit, loans, mortgages, etc. this is the best place I have found. They can teach you how to get your credit in order. Terrific forum.
So please post any gems you may have found. They can be about anything. For example, a great message board for learning about cars, playing tennis, embedded software, electronics, etc.