Bogleheads

“Welcome to the Bogleheads® wiki, a collaborative undertaking by members of the Bogleheads Community. This wiki is a reference resource for investors. Bogleheads emphasize starting early, living below one’s means, regular saving, broad diversification, and sticking to one’s investment plan.”

https://www.bogleheads.org/

Never heard of it. But, the emphasis seems right. Bookmarking.