No offense intended, but ... that isn't the most glowing recommendation.
I read it as "This book is great, really helped me understand the concepts. In fact, it helped so much I failed the class."
I read it as "This book is great, really helped me understand the concepts. In fact, it helped so much I failed the class."
So that sounds pretty encouraging.
BASIC is fine. I won't language quibble on a nice free resource.