[H1Supreme]

Came here to post something similar, so I'll upvote your comment, and add my own. I started building a Eurorack modular synthesizer in 2009. Prior to that I would mostly tweak presets on other synths. I knew what the filter did, and could adjust an envelope, but didn't have a fundamental understanding of what was going on.

When I started using the modular, I was forced to understand the signal flow. And, the patch cables provided a visual cue of what was happening. I learned more about synths in a year with my eurorack system than I did in the previous 10 with hardwired synths.

After you learn those basic rules for patching a synth, then you get to break them. (-:

Recommending something like VCV rack seems like starting with Calculus before you can solve 2+2, but it's really not. The signal flow is right there for you to observe.