Another fan of MrMoneyMustache.com here.
My favorite thread is "Epic FU I Quit" stories. Feel good and hilarious.
https://forum.mrmoneymustache.com/we...money-stories/
Bogleheads.org
DiscussCooking.com
BiggerPockets.com for real estate investors
FlyerTalk.com for travel (tho I don't travel for business)
ExpatForum.com (still thinking about moving abroad)
City-Data.com (even though some people can be mean there)
forum.purseblog.com I like the Kitchen subforum. Site was started by some wealthy gals who love very expensive designer purses and fashion.
Early-Retirement.org has the nicest people by far!