I’ve put together a series of beginner tutorials for getting started designing your own synths in Reaktor 6 Primary.
Over the course of this series, we put together a synth with selectable oscillators, filters, and multiple options for modulation. This can serve as a good hands-on introduction to synthesis in Reaktor or any other synthesis environment.
EDIT (1/4/22): If you’re ready for more, here are some intermediate tutorials too: