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Hej Chris,
this looks good and i think it'll work pretty well. but, i'd like to draw your attention on a few things. First, purchase buttons seem to be quite colourless. they're not attracting.maybe making the corner sharp rather than round and/or using vibrant colours could solve the problem. the green colour of the price is really boring. second thing is that the alignment of items under Things You Will Learn could be left instead of center. As it is now, it looks un-professional. Last of all, it might be a good idea to present some brief information about the authors somewhere at the bottom or in sub-pages.
good luck.
