UX feedback: for an opinionated guide targeted at newbies, I think the 'concepts' page should be much more of a guided introduction. I click on it and have a big basket of things in _alphabetical order_. I think it should be a top-to-bottom ordering of how a user should read them if encountering for the first time. Maybe have a separate glossary page if thats what you are going for with the alphabetical order.