.git directory

At bare minimum, the .git directory need to contain the following:

.git/
├── objects/
├── refs/
├── HEAD

• objects/: contains Git objects
• refs/: contains Git references
• HEAD: contains a reference to the current HEAD

Some additional data

.git/
├── config
├── objects/
    ├── pack/
├── hooks/
├── info/

• config: per-repository configurations
• objects/pack: for storing objects in optimized (packed) format
• info/: additional metadata

After a commit

After a single commit, the .git folder will have more information:

.git/
├── COMMIT_EDITMSG
├── index
├── logs/
├── refs/
    ├── head/main

• COMMIT_EDITMSG: If you don’t use -m, this file is what git open the editor for
• index
• logs/
• refs/heads/main: record the commit at top of main branch