Here's an A to Z guide about Git:

A - Add: A Git command used to stage changes made to the working directory.

B - Branch: A Git command used to create a new branch for code development.

C - Clone: A Git command used to make a copy of a remote repository on a local machine.

D - Diff: A Git command used to view differences between two versions of a file.

E - EOL: End of Line. Refers to the line endings in text files, which can be different for different operating systems.

F - Fetch: A Git command used to download changes from a remote repository without merging them.

G - Gitignore: A file used to ignore certain files and directories from being tracked by Git.

H - HEAD: A reference to the latest commit on the current branch.

I - Init: A Git command is used to initialize a new repository.

J - Join: A Git command used to merge changes from one branch into another.

K - Keep: A Git command used to preserve changes made to a file.

L - Log: A Git command is used to view the commit history.

M - Merge: A Git command used to combine changes from different branches.

N - New: A Git command is used to create a new repository.

O - Origin: A Git command is used to specify the default remote repository.

P - Pull: A Git command used to download and merge changes from a remote repository.

Q - Quit: A Git command used to exit a Git session.

R - Remote: A Git command used to manage remote repositories.

S - Stash: A Git command used to temporarily store changes made to a working directory.

T - Tag: A Git command used to mark a specific commit for future reference.

U - Undo: A Git command used to revert changes made to a repository.

V - View: A Git command used to display the contents of a file.

W - Working directory: The directory where changes are made before they are committed to a Git repository.

X - Xargs: A Unix command that can be used with Git to perform operations on multiple files.

Y - YAML: A file format used in Git for configuration files.

Z - Zero: A Git command is used to set the file permissions to zero.