What Is Git? Git Explained for Beginners and IT Job Seekers

Git is a distributed version control system used to track changes in source code, configuration files, scripts, and other project files.

Developers and DevOps engineers use Git to maintain code history, work on different features, recover older versions, and collaborate safely.

Inshortly

Git tracks every important change made to project files.

It helps developers:

Save different code versions
See who changed the code
Restore older versions
Work on separate branches
Merge completed changes
Collaborate without overwriting work
Manage application and infrastructure code

Git works mainly on the developer’s local computer and can be used without an internet connection.

How Git Works

Git stores project changes as commits.

A commit represents a snapshot of the project at a specific point in time.

Each commit contains:

Unique commit ID
Author name
Author email
Date and time
Commit message
Project changes

A clear commit history helps teams understand how a project changed and identify when a problem was introduced.

Git Architecture

Git uses four important areas.

1. Working Directory

The working directory is the project folder where you create, modify, or delete files.

2. Staging Area

The staging area contains the changes selected for the next commit.

git add filename

To stage all current changes:

git add .

3. Local Repository

The local repository stores commits, branches, tags, and complete project history.

It is stored inside the hidden .git directory.

git init

4. Remote Repository

A remote repository is a shared copy of the Git project hosted on a platform such as GitHub, GitLab, or Bitbucket.

Git itself manages the versions. The remote platform provides online storage and collaboration.

Basic Git Workflow

Working Directory
        ↓ git add
Staging Area
        ↓ git commit
Local Repository
        ↓ git push
Remote Repository

To receive remote changes:

Remote Repository
        ↓ git pull
Local Repository and Working Directory

Installing and Configuring Git

Check whether Git is installed:

git --version

Configure your name and email:

git config --global user.name "Your Name"
git config --global user.email "your@email.com"

Verify the configuration:

git config --list

Git records this identity in each commit.

Creating a Git Repository

Create a project directory:

mkdir my-project
cd my-project

Initialize Git:

git init

The git init command creates a hidden .git directory that stores the repository history and configuration.

Git File States

Git files normally move through four states.

Untracked

A new file that Git is not tracking.

Modified

A tracked file that has been changed.

Staged

A file selected for the next commit.

Committed

A change saved permanently in the local repository history.

Check the current file state:

git status

Essential Git Commands

Initialize a Repository

git init

Clone an Existing Repository

git clone repository-url

Check File Status

git status

Stage One File

git add filename

Stage All Changes

git add .

Create a Commit

git commit -m "Add login feature"

View Commit History

git log

Short history:

git log --oneline

View Commit Details

git show commit-id

Download Remote Changes

git pull origin main

Upload Local Commits

git push origin main

Git Init vs. Git Clone

`git init`

Use git init when starting a new local project.

git init

`git clone`

Use git clone when the project already exists in a remote repository.

git clone repository-url

Cloning downloads:

Project files
Commit history
Branch information
Remote repository configuration

Remember:

New project = git init
Existing project = git clone

What Is a Git Branch?

A branch is an independent line of development.

Branches allow developers to work on new features, bug fixes, or experiments without directly changing the stable main branch.

List branches:

git branch

Create a branch:

git branch feature-login

Create and switch to a branch:

git switch -c feature-login

Switch between branches:

git switch main

A branch is mainly a pointer to a commit. It is not a complete physical copy of the entire repository.

What Is Git Merge?

Merging combines changes from one branch into another.

To merge feature-login into main:

git switch main
git merge feature-login

You should first switch to the branch that will receive the changes.

In this example:

Source branch = feature-login
Target branch = main

What Is a Merge Conflict?

A merge conflict happens when Git cannot automatically combine overlapping changes.

This commonly occurs when two developers modify the same lines differently.

Git may display markers like these:

<<<<<<< HEAD
Current branch content
=======
Incoming branch content
>>>>>>> feature-login

To resolve the conflict:

Open the conflicted file.
Choose the correct content.
Remove the conflict markers.
Save the file.
Stage the file.
Commit the resolution.

git add filename
git commit -m "Resolve merge conflict"

What Is `.gitignore`?

The .gitignore file tells Git which files or directories should not be tracked.

Common examples include:

*.log
*.tmp
.env
build/
node_modules/

Use .gitignore for:

Log files
Temporary files
Build files
Local configuration
Environment files
IDE-generated files

Files already tracked by Git are not automatically ignored after being added to .gitignore.

Undoing Git Changes

Unstage a File

git restore --staged filename

This removes the file from the staging area but keeps its changes in the working directory.

Restore an Uncommitted File

git restore filename

Be careful because this removes uncommitted changes.

Revert a Commit

git revert commit-id

git revert creates a new commit that safely reverses an earlier commit.

It is normally safer for shared branches because it preserves history.

Remove Untracked Files

Preview first:

git clean -n

Delete untracked files:

git clean -f

Always preview before deleting.

Git Reset vs. Git Revert

Git Reset	Git Revert
Moves or changes local history	Creates a new reversing commit
Can remove commits from visible history	Preserves the original history
Better for local, unpublished work	Safer for shared branches
Can be destructive	Usually safer for teams

For shared repositories, git revert is normally the safer option.

What Are Git Tags?

A tag is a readable label attached to an important commit.

Tags are commonly used for:

Production releases
Stable versions
Application versions
Important milestones

Create an annotated tag:

git tag -a v1.0 -m "Version 1.0 release"

List tags:

git tag

View tag details:

git show v1.0

Pull Before Push

Before pushing changes, synchronize your branch with the remote repository.

git pull origin main
git push origin main

A practical workflow is:

Pull
  ↓
Modify files
  ↓
Add changes
  ↓
Commit changes
  ↓
Pull latest changes again
  ↓
Push commits

Pulling before pushing reduces rejected pushes and unexpected conflicts.

Git in DevOps

Git is a foundational DevOps tool.

DevOps teams use Git to manage:

Application source code
Terraform files
CloudFormation templates
Ansible playbooks
Dockerfiles
Kubernetes manifests
Helm charts
Jenkinsfiles
CI/CD workflow files
Shell scripts
Python automation scripts

A typical DevOps workflow looks like this:

Developer changes code
        ↓
Git tracks the changes
        ↓
Developer creates a commit
        ↓
Code is pushed to a remote repository
        ↓
CI/CD pipeline starts
        ↓
Application is built, tested, and deployed

Git provides the version history and change control required for automated software delivery.

Git Best Practices

Create separate branches for features and fixes
Write clear commit messages
Make small, focused commits
Check git status before committing
Pull the latest changes regularly
Review changes before staging
Use .gitignore
Never commit passwords or private keys
Avoid rewriting shared branch history
Create tags for important releases

Common Git Mistakes

Avoid:

Working directly on the stable branch
Writing commit messages such as “update”
Creating very large commits
Committing passwords or access keys
Using destructive commands without understanding them
Ignoring merge conflicts
Forgetting to pull remote changes
Staging unnecessary files with git add .
Deleting the .git directory accidentally

Important Git Interview Questions

What is Git?

Git is a distributed version control system used to track file changes, maintain project history, and support team collaboration.

Why is Git called distributed?

Git is distributed because each developer can have a complete local copy of the repository and its history.

Explain the Git workflow.

Changes move from the working directory to the staging area using git add, then to the local repository using git commit, and finally to a remote repository using git push.

What is a Git commit?

A commit is a saved snapshot of project changes at a specific point in time.

What is a Git branch?

A branch is an independent line of development used for features, fixes, or experiments.

What is a merge conflict?

A merge conflict happens when Git cannot automatically combine overlapping changes from different branches.

What is the difference between `git pull` and `git push`?

git pull downloads and integrates remote changes. git push uploads local commits to a remote repository.

What is the difference between `git init` and `git clone`?

git init creates a new local repository. git clone downloads an existing remote repository and its history.

What is `.gitignore`?

.gitignore contains patterns for files and directories that Git should not track.

What is the difference between `git reset` and `git revert`?

git reset changes local history, while git revert creates a new commit that safely reverses an earlier commit.

Beginner Practice Task

Complete this Git practice:

mkdir git-practice
cd git-practice

git init

echo "My Git Project" > README.md

git status
git add README.md
git commit -m "Add project README"

git switch -c feature-update

echo "Learning Git branching" >> README.md

git add README.md
git commit -m "Update README with Git learning"

git switch main
git merge feature-update

git log --oneline

This exercise covers:

Repository creation
File tracking
Staging
Commits
Branch creation
Branch switching
Merging
Commit history

Final Summary

Git is a distributed version control system used to track, manage, and recover project changes.

Its most important concepts include:

Working directory
Staging area
Local repository
Commits
Branches
Merging
Conflict resolution
Tags
Remote synchronization