Is there a good "Intro to Clockfagging" video someone could link?

I've been here since Day 1, but it's the one thing ive never understood. Obviously i know news is supposed to correlate and if its 365 day diffetence its a 0 delta: etc. but I just want a good, clear instructional with maybe some of the most obvious examples. Can any French help m3?

Sorry im a potato.