Hey, team! Really excited to get my hands on this course. I realize that you're in "early release" mode, so the following may already be fixed by the time you read this, but I thought it good to send you feedback.
The intro text speaks about Intro/Presentation.tscn. In the current downloadable code, it's called ShaderPipelineIntro. Also, there's a error at line 39 of LineDrawers.gd when executing it. It's missing the will_cull property from a child node, but I'm not exactly sure at first glance where these children are so I'm not doing a great job investigating at the moment.