Blender User Index 3D has taken on the Herculean task of explaining all the Object Constraints present in Blender in a 3-part series that concluded yesterday. He was also generous enough to offer example files with each video for 0+ on his Gumroad page.
Each part revolved around a constraint category:
Transform Constraints:
Project Files: https://a.blendernation.com/go/go.php?src=BN&url=https://gumroad.com/l/constraints
Tracking Constraints:
Project Files: https://a.blendernation.com/go/go.php?src=BN&url=https://gumroad.com/l/TrackingConstraints
Relationship Constraints:
Project Files: https://a.blendernation.com/go/go.php?src=BN&url=https://gumroad.com/l/RelationshipConstraints
Check out Index 3D’s Gumroad, Patreon and Youtube pages for more goodies: