Drupal 8 Commerce, under the hood
Last year I gave a developer driven session about Commerce 2.x on Drupalcon Amsterdam 2019. To this day, the session is still very much applicable and could help out anyone who is in need of customizing their Commerce store. For those who missed out, just re-watch the recorded session
Or check the session slides on http://presentations.robiningelbrecht.be/drupalcon-amsterdam-2019/#/
