Blender learning resources, beginner to advanced.

User Manual. Official Blender user manual.
Animation & Rigging Manual. Blender manual section on keyframes, drivers, constraints, shape keys and armature rigging.
Blender 3D Architect by Allan Brito Paid. Blender books and tutorials for architectural visualization by Allan Brito.
Blender Python API Documentation. Official Blender Python API Documentation.
blenderscripting. Blog of Blender Python snippets to get started with scripting.
Compositing Nodes List. Blender manual section listing every compositor node type and what it does.
Motion Tracking Manual. Blender manual section on motion tracking and camera solving in the Movie Clip editor.
Programming Add-ons for Blender 2.8. Free ebook on setting up a Python IDE to write Blender add-ons, worked through a sample plugin.
Realistic Hair in Blender Paid. Wingfox course on creating realistic hair in Blender.
Texture Paint Manual. Official Blender manual for the texture paint mode.