Hi, I wrote this! If you like this, you might also enjoy this series of videos I've been releasing: <a href="https://www.youtube.com/playlist?list=PLRGI9KQ3_HP_OFRG6R-p4iFgMSK1t5BHs" rel="nofollow">https://www.youtube.com/playlist?list=PLRGI9KQ3_HP_OFRG6R-p4...</a><p>They were originally made for internal consumption at Shopify, but I eventually realized that almost none of the content was proprietary so I've been re-releasing them publicly.