It's going to be interesting to see how many other things Harry learned while he was in the Alley and how many of them become known, all too quickly, to Albus of the Many Names. I quite suspect that this, or doing something stupid, will tip Ron's hand if he is a spy and make life "interesting" for him as Harry & Hermione drop him and replace him with a good and true friend.
Harry learned quite a bit from his Grandfather while in the Alley, but it was pretty much just the basics of how to tap into the Gem. Kinda like a two week course in how to use Microsoft Office.
As for Ron, I won't be doing any Ron-bashing. He's a 13 yr old kid, and 13 yr olds due to stupid things due to their emotions. God knows I did! LOL