Useful web page links for Excel users

Hi,
I'm sure most of us have some favourite Excel websites that we've gleaned from sampling, discarding and/or keeping links to what's out there on the web, but I was wondering if the Moderators / Gurus within this forum would be willing to post links to their favourite sites.

Issues of bias, affiliation, commercialism would probably come about but for all us new or semi-skilled users some sites with quality Excel examples / solutions, tip and tricks would be a boon.

I've gained some great insights on how to make my spreadsheets better from Pointy Haired Dilbert and would recommend to anyone starting out.
~please note I have nothing to gain in recommending PHD