CourseintermediatePaid
Advanced Rigging
CGMA
Advanced Rigging - A course resource
More resources on Rigging
WebsiteFree
Blender Rigging Documentation
The official Blender manual section on armatures: bones, bone properties, edit and pose modes, bone constraints, inverse kinematics, and skinning meshes to armatures, giving the reference needed to build and troubleshoot character and mechanical rigs in Blender.
BookPaid
Rig it Right! Maya Animation Rigging Concepts
Tina O'Hailey's introduction to character rigging concepts in Maya, built around tutorial exercises: joint placement and orientation, forward and inverse kinematics, constraints, deformers and skinning, and control design, explaining why each setup works so animators and riggers can build usable rigs.