As for new or changed things in HtDP2e, look at this: https://htdp.org/2018-01-06/Book/part_preface.html#%28part._delta%29 https://htdp.org/2018-01-06/Book/part

As for new or changed things in HtDP2e, look at this: https://htdp.org/2018-01-06/Book/part_preface.html#%28part._delta%29 https://htdp.org/2018-01-06/Book/part_preface.html#%28part._.... The UBC course on edX, now called HtC (How to Code), closely follows this second edition