Interview Q&A

Short answer: Comman Description Safe for shared repos? git revert Creates a new commit that undoes changes from a previous commit ✅ Yes git reset Moves the branch pointer back to a previous commit, potentially removing commits ❌ No (rewrites history)

Example code

If you realize a commit caused an error: git revert will make a new commit that undoes it. git reset will erase it as if it never happened (good for local cleanup).

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A Pull Request is a request to merge your changes from one branch or fork into another repository or branch — typically to propose new code, bug fixes, or improvements. Example: You fixed a typo or added a feature in your fork of a project. You create a PR asking the original maintainers to “pull” your changes into their main branch. PRs enable: Code review Automated testing Discussion before merging

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A commit in Git is a snapshot of your project at a specific point in time.

Explain a bit more

It records all the changes you've made to the files and saves them to the repository. Every commit has a unique ID, and it's like a save point in a video game—if something breaks, you can go back to any commit. Real-World Example: Let’s say you fixed a bug on the homepage of your app. After completing the fix, you commit the changes to the repository. Later, if the fix causes an issue, you can roll back to the previous commit.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git stash temporarily saves your uncommitted changes so you can work on something else without committing unfinished work. Example: You’re fixing a login bug but suddenly need to switch branches to fix a production issue. Instead of committing half-done code, you run: git stash git checkout main Later, you can come back and reapply your stashed work.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git stash temporarily saves your uncommitted changes so you can work on something else without committing unfinished work. Example: You’re fixing a login bug but suddenly need to switch branches to fix a production issue. Instead of committing half-done code, you run: git stash git checkout main Later, you can come back and reapply your stashed work.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: git fetch: It retrieves changes from a remote repository but does not apply them to your working directory.

Explain a bit more

You can think of it as checking for updates without actually installing them. git pull: This does two things: it fetches the latest changes and then merges them into your current branch. It's like fetching updates and immediately applying them. Real-World Example: If you're working on a project with teammates, git fetch allows you to see what changes have been made without affecting your code. git pull, on the other hand, will update your local copy and merge those changes with your work, which can sometimes result in merge conflicts.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: time, including changes and a message.

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: (Duplicate of #4) A snapshot of your project at a specific point in time, including changes and a message.

Real-world example (ShopNest)

Prefer clear commits: fix(cart): prevent negative quantities instead of update.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A lightweight, movable pointer to a commit, allowing for parallel development.

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Aspect GitHub Flow Git Flow Purpose Simple branching model for continuous delivery Structured model for release management Branche Only main and short-lived feature branches Multiple: main, develop, feature, release, hotfix Workflow Create branch → Commit → Pull Request → Merge → Deploy Feature branches merge into develop, then release/hotfix merges into main Use Case SaaS projects, frequent deploys Complex products…

Example code

GitHub Flow → Used by startups deploying updates daily. Git Flow → Used by large software teams (e.g., enterprise apps) with versioned releases.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A detached HEAD happens when Git’s HEAD (your current position) points to a specific commit instead of a branch.

Explain a bit more

If you make new commits in this state, they won’t belong to any branch — you could lose them if you switch branches. How to fix it: If you accidentally commit in a detached HEAD state: git switch -c temp-branch This creates a new branch from your current state so your commits aren’t lost. Example: You checked out an old commit to test something: git checkout a1b2c3d If you make changes, create a branch to save them before switching back.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A detached HEAD occurs when Git’s HEAD (which points to your current branch) points to a specific commit instead of a branch.

Explain a bit more

This means you’re not working on any branch — any new commits made in this state are “orphaned” unless you create a branch from them. Example: If you check out an old commit directly: git checkout a1b2c3d You’re in a detached HEAD state. If you make changes here and don’t create a new branch, you could lose them later. Fix: Create a new branch to save your work: git checkout -b hotfix/rollback-test

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: The .gitignore file tells Git which files or directories it should ignore when tracking changes.

Explain a bit more

This is useful for files that aren’t necessary in the repository, like log files, compiled binaries, or local configuration files. Real-World Example: If you're working on a Node.js project, you likely don’t want to track the node_modules/ directory, since it can be recreated by running npm install. You can add node_modules/ to your .gitignore file to ensure that Git doesn't track those files.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: to build, test, and deploy code directly from GitHub.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: The default name for the remote repository from which a project was originally cloned.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A pointer to the current commit you are on in your local repository.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A configuration file that stores user-specific Git settings (e.g., username, email, aliases).

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1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Shows changes between the staging area and the last commit.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Displays the commit history of the current branch.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Shows the URLs of the remote repositories associated with your local repo.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: performing a binary search on the commit history.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A command used to find the commit that introduced a bug by performing a binary search on the commit history.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Checks the integrity of the Git file system.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Cleans up unnecessary files and optimizes the local repository.

Real-world example (ShopNest)

ShopNest’s team uses GitHub PRs with reviews and CI checks so broken builds never reach production unnoticed.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: A merge where the branch being merged can simply be moved forward to the tip of the other branch without creating a new merge commit.

Real-world example (ShopNest)

Feature work for “UPI payment” lives on feature/upi-payment. Open a PR to main; resolve conflicts before merge.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.