Blender learning resources, beginner to advanced.

User Manual. Official Blender user manual.
Animation & Rigging Manual. Animation & Rigging Manual.
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. Compositing Nodes List.
Motion Tracking Manual. Motion Tracking Manual.
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. Hair creation course.
Texture Paint Manual. Official Blender manual for the texture paint mode.