Idea taken from US forums.

Post things you didn't know until recently!

I will start off:
I didn't know that when your action bars are locked, you could still move buttons while holding shift.

I also didn't know that you can mass convert emblems (triumph to conquest to valour to heroism) by shift clicking.

Your turn!

This thread deserves some recognition. As seen already, it is helping players discover some helpful pieces of information that they didn't already know - for whatever reason.

That said, I figured I would add my own 2cp.

It took me the better part of 3 years to figure out I could make my macros use the icon and cooldown of it's intended spell/ability. Until I figured that part out, I kept memorizing new icons for my spells and abilities... and it was beginning to get quite complicated by the time I was binding spells on my 4th max level character. So, as clever as I thought I was -- coming up with my own nifty macros and whatnot -- I apparently missed the very basics of them.