while i agree that there's not enough c4d specific rigging tutorials out there, keep in mind that the principles are the very same across all apps.
so if you got the basics down and know how our constraints work, if you know the caveats of our ik and ik spline solvers, if you somewhat understood priorities, if you know the basics of xpresso, you can really watch any maya or blender or even houdini rigging tutorial and translate the technique over to c4d.
i might do a tutorial about spline ik soon, since i have the feeling this is something a lot of people struggle with, i kn