Syntorial is a comprehensive hands-on introduction to subtractive (IIRC?) synth programming (not DSP programming, but fiddling knobs like you would in a typical

Syntorial is a comprehensive hands-on introduction to subtractive (IIRC?) synth programming (not DSP programming, but fiddling knobs like you would in a typical commercial soft synth), including add-ons specifically for popular commercial soft synths like Massive. Their forum also encourages people to share synths they hear in popular music and help each other recreate the sound. They also produce Building Blocks, which is all about music theory and composition and teaches some basic beats (and, more importantly, I think, how to think about beats so that it becomes easier to recreate ones you hear from scratch).