Well, My Demon Died On Me Yesterday

Check for spark... pull coil wire out of distributor, create a gap for the end to the body on car or some other metal that you can see when cranking. Crank engine, if it didn't spark, you have an issue in that circuit.

Do the same thing with it in run at key, except jump the starter relay to get it to crank. If no spark, you have an issue. Simple test to see if ballast may be bad.

Alligator clipped wire, go from positive on battery to dist side of ballast. If it sparks, the ballast or feed into ballast is bad.

Learn basic diagnosing procedures, no different from being a computer geek and having a checklist when a computer stops working. Where is the issue, hardware, software, you get clues as to the problems/source.