important basics left to explain

status (basics are explained, but not in depth...)
commit --amend
reset
restore
nomenclature of HEAD/repository/^/~/@{u}/...
merge
(clone - hard to do sensibly)
range-diff

less important basics

add -p
tag (interactively)
revert
config
- alias (explains redeem-nuggit)
submodule
rm / mv
worktree
remote
bisect
merge-base
ranges (HEAD...FETCH_HEAD)
log -S
grep

"fancy" ideas for clues

range-diff (merge-base)
bisect
blame
grep

List of places to hide

reverted commit
different branch
- git log --all --decorate
tag
- git describe
- all tags
different remote
stash
.git/config (e.g. author)
- alias
hooks (e.g. automatically add nuggit to commit message)
- post-merge
- post-rewrite e.g. for commit --amend
--word-diff --word-diff-regex=. (nuggit hidden "inbetween" two commits)
submodule
blame first column
untracked files (git clean --dry-run or git status --ignored)
files in .gitignore
files in .git/info/exclude
merge commit (git merge --no-commit)
file encrypted with filter
rerere for specific conflict
apply a number of patches (and maybe calculate the nuggit, so that it isn't obvious from the patches themselves?)
custom subcommand (requires setting up the $PATH)
git reflog => detached commit
random object in .git/objects (git prune --dry-run or hint of hash?)
- tree / file / blob
- git cat-file -p

Tools

noninteractive interactive rebase (for reflog)
- replace content of todo file with custom content:
  - streameditor.sh:
```
#!/usr/bin/env bash
cat > "$1" << EOF
r commit
pick commit2
EOF
```
  - GIT_EDITOR="sed -i -e 's/old text in commit msg/fancy new text/g'" GIT_SEQUENCE_EDITOR="./streameditor.sh" git rebase -i HEAD~6

hooks left to do:

See documentation in the git repository under Documentation/githooks.txt

applypatch-msg
pre-applypatch
post-applypatch
pre-commit
pre-merge-commit
commit-msg
post-commit
post-merge
pre-push
pre-receive
update
proc-receive
post-receive
reference-transaction
post-rewrite
sendemail-validate
fsmonitor-watchman
p4-changelist
p4-prepare-changelist
p4-post-changelist
p4-pre-submit
post-index-change