[Luctct]

Good news: you don't need music theory and I don't even recommend it. Bad news: it takes a lot of work to make one song. A lot.

I suggest you download Caustic for Windows (free, also runs on Linux with Wine) or Android ($10 I think): https://singlecellsoftware.com/

And just fiddle with it. You will get the hang of it. But you will see that building up an entire song takes a lot of time and effort.

Caustic is not good enough for serious business. You should aim for a DAW with plugins. But Caustic can be a very good start for someone who knows nothing. Some DAWs are easier than others. Tracktion Waveform has a very capable free version. Mulab also has a free version but with limitations.

The story people are commenting here is about a "tracker" type of DAW. I find those horribly difficult to use. I suggest you avoid them.