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+# Git
+
+## Concepts
+
+* hash
+  * sha1 (sha256)
+
+## Porcelain
+
+* git init
+  * bare | non-bare
+* git config
+  * user name & email
+  * description
+* git worktree
+
+## Plumbing
+
+* .git/config
+* .git/description
+* .git/objects
+  * .git/objects
+  * git hash-object -w file
+  * git cat-file -p hash