Investment/ stock market stuff you can check out. (Not my field per se but I trust the links to resources and reading material to be useful since its popular)
faq - investing
faq - portfolios
Don't forget rule #1. • /r/InvestmentClub
faq - financialindependence
https://www.investopedia.com
/
I mostly check the business stuff time to time for idea and to read and learn. A good board will have an faq or wiki page with links to books and resources and that will be the most useful part, especially if you are just getting into a certain discipline... I don't really get involved in discussions or pay them much mind since I'm just here to absorb the resources from them and bring them back to my community lol.
index - FulfillmentByAmazon
faq - financialindependence
faq - Entrepreneur
index - startups
index - webmarketing
(Not biz related per se but very enlightening)
index - Frugal
.
Dap/REP