Video lesson: Git History as a Reproducible Change Record

Lesson promise

By the end, the learner should be able to explain the core model for git history as a reproducible change record, apply it to a concrete input, and identify when its usual shortcut or guarantee stops applying. This is a recording brief; publish it as a playable lesson after the narration and visual sequence have been produced and reviewed.

Narration draft

Git records snapshots and relationships between commits. A branch is a movable reference to a commit; creating a branch is cheap because it does not copy the repository. This model supports parallel work, review, and recovery when changes are small and their intent is clear.

A commit records a tree plus metadata and parent references. A merge combines histories while preserving their ancestry; a rebase reapplies commits onto a new base and changes their identities. Pull requests use these histories to make a proposed change reviewable before integration.

Git does not automatically make a change correct or safe. Large mixed-purpose commits obscure intent, and rewriting a shared branch can disrupt collaborators. A clean history helps investigation, but preserve the original evidence when correcting a production incident.

Visual sequence

1. Put the input and assumptions on screen. Ask the learner to predict the next state before revealing it.
2. Animate the representation and show the operation one transition at a time.
3. Pause at the boundary case in the companion article and compare the result with the invariant.
4. End with the exercise prompt: A feature branch contains one implementation commit and one unrelated formatting commit. Explain how splitting the changes improves review and how rebase affects commit identifiers.

Companion material

Use the article, trace, and interactive concept flow as the learner’s written and visual references. The video remains planned until an actual playable media URL and reviewed transcript are available.