This page is your "wall of mastery." It shows every module you've visited, completed, and scored on — across all three tiers. Print it for a clean PDF certificate.
Tier 1 covered the porcelain — 47 user-facing commands you'll touch most days. You learned the working-tree → index → object-database flow that every other Git operation builds on. You know that a branch is a movable pointer to a commit, that HEAD is a symbolic ref to that pointer, and that fast-forward merges aren't really merges at all — they're pointer moves.
The big mental shift in Tier 1 was that commits are snapshots, not diffs. Git stores the whole tree at each commit and computes diffs lazily. That's why branching is cheap (a 41-byte file), why git log walks parents (it's a DAG, not a linear list), and why git reset and git revert look superficially similar but do entirely different things — one moves the pointer, the other adds a new commit.
You also met the reflog (every branch-tip move recorded for 90 days), stash (a tiny side-stack of dirty work), and the rebasing-history triad (rebase, cherry-pick, revert). You should be allergic to force-pushing shared branches by now. If you aren't, re-read module 21.
git init— M02git clone— M03git status— M04git add— M05git stage— M06git commit— M07git diff— M08git log— M09git show— M10git mv— M11git rm— M12git restore— M13git reset— M14git revert— M15git checkout— M16git switch— M17git branch— M18git tag— M19git fetch— M20git pull— M21git push— M22git merge— M23git rebase— M24git cherry-pick— M25git stash— M26git clean— M27git shortlog— M28git describe— M29git grep— M30git bisect— M31git notes— M32git worktree— M33git submodule— M34git sparse-checkout— M35git archive— M36git bundle— M37git format-patch— M38git am— M39git range-diff— M40git maintenance— M41git gc— M42git backfill— M43git history— M44git citool— M45git gui— M46gitk— M47scalar—Tier 2 expanded the surface area: 57 ancillary, foreign-SCM, and helper commands. You learned why Git's design ages well — the porcelain has changed (think switch/restore replacing checkout), but the helpers haven't because they're already minimal and orthogonal.
You met config and its three layers (system → global → local), the reflog from a recovery angle, the remote family for managing more than one upstream, and replace for the rare situation where you need to lie to history without rewriting it. You saw how blame and annotate use merge-base under the hood, why count-objects -v is your first stop when a repo bloats, and what happens when you actually run fsck on a repo someone has been "fixing" by hand.
The bridge commands (svn, p4, cvs*) showed you that Git was designed from day one to import from anything. Most of them are crusty, but they're also durable — they'll still be there in 2034 when you inherit a Mercurial repo from someone's archive.
The helpers — check-attr, check-ignore, interpret-trailers, credential — are the small tools that scripts and hooks lean on. Once you know they exist, you stop reaching for grep + awk and start using the things Git already ships with.
git config— M02git fast-export— M03git fast-import— M04git filter-branch— M05git mergetool— M06git pack-refs— M07git prune— M08git reflog— M09git refs— M10git remote— M11git repack— M12git replace— M13git annotate— M14git blame— M15git bugreport— M16git count-objects— M17git diagnose— M18git difftool— M19git fsck— M20git help— M21git instaweb— M22git merge-tree— M23git rerere— M24git show-branch— M25git verify-commit— M26git verify-tag— M27git version— M28git whatchanged— M29gitweb— M30git archimport— M31git cvsexportcommit— M32git cvsimport— M33git cvsserver— M34git imap-send— M35git p4— M36git quiltimport— M37git request-pull— M38git send-email— M39git svn— M40git check-attr— M41git check-ignore— M42git check-mailmap— M43git check-ref-format— M44git column— M45git credential— M46git credential-cache— M47git credential-store— M48git fmt-merge-msg— M49git hook— M50git interpret-trailers— M51git mailinfo— M52git mailsplit— M53git merge-one-file— M54git patch-id— M55git sh-i18n— M56git sh-setup— M57git stripspace—Tier 3 was the plumbing — 55 modules that strip away every layer of porcelain. You can now read commits with cat-file -p, walk trees with ls-tree, build a brand-new commit with hash-object + mktree + commit-tree + update-ref, and understand precisely what git commit does when you press Enter.
You learned that the object database is content-addressable: blobs, trees, commits, and tags all hash to a SHA, all live as files (or in packs), and nothing — nothing — is mutated in place. New commits get new SHAs. Old objects stay until gc decides nothing references them anymore.
You met rev-parse (the universal revision parser) and for-each-ref (the universal ref iterator). Together they're the entire shell-scripting toolkit: with these two and a while loop, you can write any custom Git report you'd ever need.
You saw the transfer protocol: upload-pack and fetch-pack negotiating "what do you have?" and "what do I need?" before sending a pack. You saw receive-pack validating an incoming push, and update-server-info keeping dumb HTTP servers honest.
You finished with git daemon, git http-backend, and git shell — the three ways to run Git as a server without depending on GitHub or anything else. Which is, of course, the point: Git is fully decentralized. Every clone is a complete repo. Every workflow is yours to choose.
That's the course. Print this page. Hang it on the wall. Get back to work.
git apply— M02git checkout-index— M03git commit-graph— M04git commit-tree— M05git hash-object— M06git index-pack— M07git merge-file— M08git merge-index— M09git mktag— M10git mktree— M11git multi-pack-index— M12git pack-objects— M13git prune-packed— M14git read-tree— M15git replay— M16git symbolic-ref— M17git unpack-objects— M18git update-index— M19git update-ref— M20git write-tree— M21git cat-file— M22git cherry— M23git diff-files— M24git diff-index— M25git diff-pairs— M26git diff-tree— M27git for-each-ref— M28git for-each-repo— M29git get-tar-commit-id— M30git last-modified— M31git ls-files— M32git ls-remote— M33git ls-tree— M34git merge-base— M35git name-rev— M36git pack-redundant— M37git repo— M38git rev-list— M39git rev-parse— M40git show-index— M41git show-ref— M42git unpack-file— M43git var— M44git verify-pack— M45git daemon— M46git fetch-pack— M47git http-backend— M48git send-pack— M49git update-server-info— M50git http-fetch— M51git http-push— M52git receive-pack— M53git shell— M54git upload-archive— M55git upload-pack—