These are my notes on setting up a custom theme in Drupal 8.
This is a learning project for me. With that in mind, these notes are most useful if you want to strip Drupal down to the basics and work your way up. There is a built-in theme called Classy that is a great starter theme. For this exercise though, I wanted to start even more minimal than that. I want to minimise the number of classes applied to the theme and I want to remove all css. Initially, I want my theme to look like the screenshot on this page.