A point of.. proofreading I guess.

In lesson 1 I learn that my opening range from the CO contains ATs, from button A9s and KJ.

In lesson 3 I am told to expand my button opening range (only) with AT, A9 and KJ (and QJ). Of the four two of them are already in my range if suited and while I can understand that the writing here means ATo and A9o some small measure of nod in the direction of the suited versions already being in your range wouldn't be out of place. KJ already being in the range (no suitedness noted in lesson 1) makes it seem like a very odd customer.

I'll withhold comment on whether KJ should be KJs in lesson 1, absent in lesson 1 or replaced by KT or something in lesson 3 - it's all weaktight to me I'm afraid.

That said - looking at Spoon's post on blind stealing (required reading for lesson 3) he goes on to suggest people start blind stealing with suited connectors before starting to play suited aces. ATs is not quite what I would consider Ace-rag suited, but A9s is beginning to look borderline.