Blender tutorial: make an object move along a path. Two parts: attach the object to the path, then animate the path itself.
Step 1: Add a path #
How: Shift-A → Curve → Path. Then Edit mode to reshape the path.
Step 2: Attach the object to the path #
How: Object mode → select the object → add constraint → Follow Path.
Step 3: Animate the path #
How: select the path → Edit mode → select a few points → Ctrl-H (Hook to New Object). A new empty is created.
Back in Object mode, animate the empty — the object now moves along the animated path.