Haskell Programming from first principles

Pontifications

I fell in love with this tutorial so I bought the book :-) ! I think I have read at least 6 or 7 explanations of lambda calculus before but for whatever reason (writing style? the level of detail? I actually paid attention :-) ?) it clicked this time.
Beta Reduction is difficult. I think it would have been better to completely explain exercise 7 (scroll down to “Beta Reduce on page 49”) with a diagram and/or with the “:=” notation used previously. Other than that, the other exercises were explained well.