I think the it might be worth mentioning the build_assets and how to set the domain as those are the two I use most often when UI testing. So easy to forget to build the assets - and so wonder why your change didn't work or to end up with every attempt to reach a page redirecting to example.org if the domain isn't set - especially if you open in a different port to normal to say compare the UI on master alongside your branch.

Please do add things you find helpful once this is merged! I have been approaching these docs-in-progress in a very streamlined manner--only adding sections and pages when they are fresh in my mind because I've just dealt with them while making or fixing something, so I am going to refrain from aiming for completeness at this stage, or I would never emerge from the writing cave 😄