List of SharePoint Resources

I was recently asked by a fellow Victoria Office 365 Users Group member:

“Can you recommend a forum where I can go for questions in regard to SharePoint functionality?”

My response was: 

When I am seeking answers about SharePoint, these are the publicly accessible sites and forums that I visit:

What SharePoint-related forum do you use when seeking answers? Share your favourites in the comments below.

(I’ll update the list with vetted answers.)