Thanks for your (unsolicited) advice - though I'm under no such obligation as there's nothing being sold here. The initial concepts have IMO been presented satisfactorily at least, so it's now entirely down to the interest and effort of any would-be students. I'm not promoting anything commercial - it's purely out of love for the subject matter. If others don't share such passions then that's entirely understandable - each to their own.
Sure thing - I've deleted your account.
Sure thing - I've deleted your account.