[GaryPalmer]

Better start with something like Ableton. Tons of tutorials on youtube and the interface makes it much more clear what is actually happening.

These trackers are built around the limitation of old computers, some people prefer working that way because that's how they started but I wouldn't bother with them as a beginner nowadays. Some DAWs like reason try to emulate a real studio with cables and all, simmilar to this pico-8 app, but again, if you never worked in a real studio why would you bother?

The only "real" classical music theory you need to know is Scales, the bigger chunk will be knowledge about digital audio production. Synthesizers, compressors, filters, ... that information is also plenty available on youtube.