Well, unless I misread the tutorial, I believe it said it was skipping the "basics," without even iterating (non-vaguely) what the "basics" are.
Also, another question came up:
6. How do I open maps other than GFZ1 in SRB2.srb in SRB2 Builder? After 2.0.6 was released, it seems only GFZ Act 1...