List of most asked Programming Interview Questions.

Are you preparing for a coding interview? This tweet is for you. It contains a list of the most asked interview questions from each topic.

Arrays

- How is an array sorted using quicksort?
- How do you reverse an array?
- How do you remove duplicates from an array?
- How do you find the 2nd largest number in an unsorted integer array?

Linked Lists

- How do you find the length of a linked list?
- How do you reverse a linked list?
- How do you find the third node from the end?
- How are duplicate nodes removed in an unsorted linked list?

Strings

- How do you check if a string contains only digits?
- How can a given string be reversed?
- How do you find the first non-repeated character?
- How do you find duplicate characters in strings?

Binary Trees

- How are all leaves of a binary tree printed?
- How do you check if a tree is a binary search tree?
- How is a binary search tree implemented?
- Find the lowest common ancestor in a binary tree?

Graph

- How to detect a cycle in a directed graph?
- How to detect a cycle in an undirected graph?
- Find the total number of strongly connected components?
- Find whether a path exists between two nodes of a graph?
- Find the minimum number of swaps required to sort an array.

Dynamic Programming

1. Find the longest common subsequence?
2. Find the longest common substring?
3. Coin change problem?
4. Box stacking problem?
5. Count the number of ways to cover a distance?

Best DSA RESOURCES: https://topmate.io/coding/886874

All the best 👍👍

Web Development Essentials to build modern, responsive websites:

1. HTML (Structure)
Tags, Elements, and Attributes
Headings, Paragraphs, Lists
Forms, Inputs, Buttons
Images, Videos, Links
Semantic HTML: <header>, <nav>, <main>, <footer>

2. CSS (Styling)
Selectors, Properties, and Values
Box Model (margin, padding, border)
Flexbox & Grid Layout
Positioning (static, relative, absolute, fixed, sticky)
Media Queries (Responsive Design)

3. JavaScript (Interactivity)
Variables, Data Types, Operators
Functions, Conditionals, Loops
DOM Manipulation (getElementById, addEventListener)
Events (click, submit, change)
Arrays & Objects

4. Version Control (Git & GitHub)
Initialize repository, clone, commit, push, pull
Branching and merge conflicts
Hosting code on GitHub

5. Responsive Design
Mobile-first approach
Viewport meta tag
Flexbox and CSS Grid for layouts
Using relative units (%, em, rem)

6. Browser Dev Tools
Inspect elements
Console for debugging JavaScript
Network tab for API requests

7. Basic SEO & Accessibility
Title tags, meta descriptions
Alt attributes for images
Proper use of semantic tags

8. Deployment
Hosting on GitHub Pages, Netlify, or Vercel
Domain name basics
Continuous deployment setup

Web Development Resources ⬇️
https://whatsapp.com/channel/0029VaiSdWu4NVis9yNEE72z

React with ❤️ for the detailed explanation

🔅 Most important SQL commands

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✅ 8-Week Beginner Roadmap to Learn Web Development 🌐✨

🗓️ Week 1: Build a Strong Foundation
⦁ Learn HTML: structure web content with tags, lists, tables, forms
⦁ Learn CSS: style webpages using selectors, properties, layouts
⦁ Practice on interactive platforms like freeCodeCamp or The Odin Project

🗓️ Week 2: Dive into JavaScript Basics
⦁ Understand variables, functions, loops, conditionals, events
⦁ Get familiar with making pages interactive (e.g., to-do list, calculator)
⦁ Use small projects to solidify learning

🗓️ Week 3: Advanced CSS & Responsive Design
⦁ Learn Flexbox, Grid, media queries for responsive layouts
⦁ Explore CSS frameworks like Bootstrap or Tailwind CSS
⦁ Practice building mobile-friendly web pages

🗓️ Week 4: Front-End Frameworks Basics
⦁ Choose one: React.js (most popular), Vue.js (easy for beginners), or Angular
⦁ Learn component-based architecture and state management basics
⦁ Build small UI components (buttons, forms, modals)

🗓️ Week 5: Version Control with Git & GitHub
⦁ Learn Git basics: init, add, commit, branch, merge, push
⦁ Host projects on GitHub and understand collaboration workflows
⦁ Practice by pushing your previous week projects

🗓️ Week 6: Back-End Basics
⦁ Understand what servers and APIs are
⦁ Learn a backend language like Node.js (JavaScript) or Python (recommended for beginners)
⦁ Explore databases basics (SQL or NoSQL) and CRUD operations

🗓️ Week 7: Building Full-Stack Applications
⦁ Combine front-end and back-end skills in simple projects
⦁ Learn about RESTful APIs, authentication & authorization basics
⦁ Deploy projects on platforms like Heroku, Netlify, or Vercel

🗓️ Week 8: Capstone Project + Deployment
⦁ Build a complete web app (e.g., blog, to-do list, portfolio) from scratch
⦁ Make sure it’s responsive, interactive, and connected to a database
⦁ Deploy and share it online (GitHub + hosting platform)

💡 Tips:
⦁ Code daily and build small projects to practice concepts
⦁ Use resources like freeCodeCamp, The Odin Project, or YouTube tutorials

💬 Tap ❤️ for the detailed explanation of each topic!

✅ Frontend Developer Essential Skills Checklist 🌐👨‍💻

1️⃣ HTML (Structure) 
▪ Tags, Elements, Attributes 
▪ Forms, Tables, Lists 
▪ Semantic HTML

2️⃣ CSS (Styling) 
▪ Selectors, Box Model 
▪ Flexbox & Grid 
▪ Media Queries (Responsive Design) 
▪ CSS Animations & Transitions

3️⃣ JavaScript (Functionality) 
▪ Variables, Loops, Functions 
▪ DOM Manipulation 
▪ Events & Event Listeners 
▪ ES6+ Features (let/const, arrow functions, destructuring)

4️⃣ Version Control (Git + GitHub) 
▪ init, add, commit, push, pull 
▪ Branching & Merging 
▪ Hosting projects on GitHub

5️⃣ Responsive Design 
▪ Mobile-first design 
▪ Breakpoints 
▪ Viewport units & rem/em

6️⃣ Frontend Frameworks 
▪ React.js (most popular) 
▪ Understanding Components, Props, State 
▪ JSX & Hooks (useState, useEffect)

7️⃣ Package Managers & Tools 
▪ npm/yarn basics 
▪ Install & use libraries (e.g., Axios, React Router) 
▪ Basic bundlers (Webpack, Vite - optional)

8️⃣ APIs & Fetching Data 
▪ Fetch API / Axios 
▪ Async/Await 
▪ Working with JSON

9️⃣ Deployment 
▪ GitHub Pages, Netlify, Vercel 
▪ Hosting static or React apps 
▪ Basic CI/CD knowledge (bonus)

💡 Build a portfolio website showcasing your projects!

Frontend Development Resources: 
https://whatsapp.com/channel/0029VaxfCpv2v1IqQjv6Ke0r

💬 Tap ❤️ for more!

🔟 Web development project ideas for beginners

Personal Portfolio Website: Create a website showcasing your skills, projects, and resume. This will help you practice HTML, CSS, and potentially some JavaScript for interactivity.

To-Do List App: Build a simple to-do list application using HTML, CSS, and JavaScript. You can gradually enhance it by adding features like task priority, due dates, and local storage.

Blog Platform: Create a basic blog platform where users can create, edit, and delete posts. This will give you experience with user authentication, databases, and CRUD operations.

E-commerce Website: Design a mock e-commerce site to learn about product listings, shopping carts, and checkout processes. This project will introduce you to handling user input and creating dynamic content.

Weather App: Develop a weather app that fetches data from a weather API and displays current conditions and forecasts. This project will involve API integration and working with JSON data.

Recipe Sharing Site: Build a platform where users can share and browse recipes. You can implement search functionality and user authentication to enhance the project.

Social Media Dashboard: Create a simplified social media dashboard that displays metrics like followers, likes, and comments. This project will help you practice data visualization and working with APIs.

Online Quiz App: Develop an online quiz application that lets users take quizzes on various topics. You can include features like multiple-choice questions, timers, and score tracking.

Personal Blog: Start your own blog by developing a content management system (CMS) where you can create, edit, and publish articles. This will give you hands-on experience with database management.

Event Countdown Timer: Build a countdown timer for upcoming events. You can make it interactive by allowing users to set their own event names and dates.

Remember, the key is to start small and gradually add complexity to your projects as you become more comfortable with different technologies concepts. These projects will not only showcase your skills to potential employers but also help you learn and grow as a web developer.

Free Resources to learn web development https://t.iss.one/free4unow_backup/554

ENJOY LEARNING 👍👍

YouTube channels for web development languages:

𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲𝘀 & 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀
HTML/CSS 🎨 – Kevin Powell
JavaScript 🌐 – The Net Ninja
TypeScript 📘 – Academind
React ⚛️ – Traversy Media
Angular 🔺 – Academind
Vue. js 🟩 – Vue Mastery

𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲𝘀 & 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀
Node. js 🚀 – Traversy Media
PHP 🐘 – PHP Academy
Ruby on Rails 💎 – Drifting Ruby
Django (Python) 🐍 – Corey Schafer
Flask (Python) 🔥 – Pretty Printed
ASP. NET (C#) 🎯 – IAmTimCorey

𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀 & 𝗗𝗲𝘃𝗢𝗽𝘀
SQL 🗄️ – DataSimplifier
MongoDB 🍃 – MongoDB Official
Docker 🐳 – TechWorld with Nana

React ❤️ for more

✅ JavaScript For Everything 💻🚀

🔹 JS + React = Front-end development
🔹 JS + Node.js = Server-side apps & APIs
🔹 JS + TypeScript = Typed syntax & better code quality
🔹 JS + D3.js = Interactive data visualizations
🔹 JS + Three.js = 3D graphics in the browser
🔹 JS + Jest = Unit & integration testing
🔹 JS + jQuery = Easy DOM manipulation
🔹 JS + Next.js = Full-stack React + SSR apps
🔹 JS + Express = Build web servers & backends
🔹 JS + Phaser = Game development
🔹 JS + Electron = Cross-platform desktop apps
🔹 JS + TensorFlow.js = AI & Machine Learning in browser/server
🔹 JS + Puppeteer/Cheerio = Automation & web scraping
🔹 JS + Web3.js = Blockchain & decentralized apps
🔹 JS + IoT platforms = Hardware & device control

💬 Tap ❤️ if you agree!

Website Development Roadmap – 2025

🔹 Stage 1: HTML – Learn the basics of web page structure.

🔹 Stage 2: CSS – Style and enhance web pages (Flexbox, Grid, Animations).

🔹 Stage 3: JavaScript (ES6+) – Add interactivity and dynamic features.

🔹 Stage 4: Git & GitHub – Manage code versions and collaborate.

🔹 Stage 5: Responsive Design – Make websites mobile-friendly (Media Queries, Bootstrap, Tailwind CSS).

🔹 Stage 6: UI/UX Basics – Understand user experience and design principles.

🔹 Stage 7: JavaScript Frameworks – Learn React.js, Vue.js, or Angular for interactive UIs.

🔹 Stage 8: Backend Development – Use Node.js, PHP, Python, or Ruby to
build server-side logic.

🔹 Stage 9: Databases – Work with MySQL, PostgreSQL, or MongoDB for data storage.

🔹 Stage 10: RESTful APIs & GraphQL – Create APIs for data communication.

🔹 Stage 11: Authentication & Security – Implement JWT, OAuth, and HTTPS best practices.

🔹 Stage 12: Full Stack Project – Build a fully functional website with both frontend and backend.
🔹 Stage 13: Testing & Debugging – Use Jest, Cypress, or other testing tools.
🔹 Stage 14: Deployment – Host websites using Netlify, Vercel, or cloud services.
🔹 Stage 15: Performance Optimization – Improve website speed (Lazy Loading, CDN, Caching).

📂 Web Development Resources

ENJOY LEARNING 👍👍

Backend Developer Essential Concepts 👆

✅ Python for Web Development (Flask / Django) 🧑‍💻🌐

Want to build web apps with Python? Two top frameworks to know:

1️⃣ Flask – Lightweight & Flexible
⦁  Micro-framework, perfect for beginners
⦁  Simple, fast & easy to scale
⦁  Key concepts: 
   -  @app.route() — define URLs 
   -  render_template() — load HTML pages 
   -  request, session, redirect — handle forms, sessions & navigation 
   -  Uses Jinja2 for dynamic HTML
⦁  Sample code:

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def home():
    return "Hello, Flask!"

if __name__ == '__main__':
    app.run(debug=True)

⦁  Use Flask for small web apps, APIs, prototypes & dashboards

2️⃣ Django – Full-Featured Framework
⦁  Powerful, batteries-included framework
⦁  Built-in admin panel, ORM, authentication & more
⦁  Core parts: 
   -  Models → Database 
   -  Views → Logic 
   -  Templates → Frontend 
   -  URLs → Routing 
   -  Admin → Auto-generated UI for DB
⦁  Use Django for large web apps like eCommerce, blogs, CMS with auth & permissions

🛠️ Helpful tools to learn:
⦁  HTML/CSS basics
⦁  JavaScript for interactivity
⦁  Postman to test APIs
⦁  SQLite/PostgreSQL databases

📌 Tip: Start with Flask to learn basics, then move to Django for full-stack apps!

💬 Double Tap ❤️ for more!

✅ Top 10 Web Development Interview Questions (2025) 🌐💻

1️⃣ Difference between ID and Class selectors in CSS?
⦁ ID is unique and used once per page (#id)
⦁ Class can be reused multiple times (.class)

2️⃣ What’s the difference between responsive and adaptive design?
⦁ Responsive: fluid layouts adjusting to screen size
⦁ Adaptive: predefined layouts for specific screen widths

3️⃣ Explain the box model in CSS.
⦁ Content + padding + border + margin — defines space and layout of elements

4️⃣ How do you vertically and horizontally center an element in CSS?
⦁ Using Flexbox:
display: flex;
justify-content: center;
align-items: center;


5️⃣ What is Cross-Origin Resource Sharing (CORS), and why is it important?
⦁ Security feature to allow or block resource requests between different domains.

6️⃣ Explain event delegation in JavaScript.
⦁ A technique to handle events at a parent element instead of multiple child elements.

7️⃣ How do you improve webpage load speed?
⦁ Minify CSS/JS, optimize images, lazy loading, use CDN, cache resources.

8️⃣ What is the difference between null and undefined in JavaScript?
⦁ null: explicit absence of value
⦁ undefined: variable declared but not assigned

9️⃣ Describe a RESTful API and its methods.
⦁ Stateless API using HTTP methods: GET, POST, PUT, DELETE for CRUD.

🔟 How would you ensure web accessibility?
⦁ Use semantic HTML, ARIA labels, keyboard navigation, color contrast, alt texts.

💬 Tap ❤️ for more!

Frontend vs Backend👨‍💻

Here are the main points about frontend and backend development:

Frontend:
1. Client-side aspect of web development.
2. User interacts directly with the frontend.
3. Includes user interface design, layout, and functionality.
4. Technologies: HTML, CSS, JavaScript.
5. Responsible for what users see and interact with on the browser.
6. Executes on the user's device (browser).

Backend:
1. Server-side aspect of web development.
2. Users don't directly interact with the backend.
3. Manages server, application logic, and database interactions.
4. Technologies: Python, Java, Ruby, etc.
5. Handles user requests, processes data, and sends responses.
6. Executes on the server.

Netflix Tech stack 👆

Don't Confuse to learn Python.

Learn This Concept to be proficient in Python.

𝗕𝗮𝘀𝗶𝗰𝘀 𝗼𝗳 𝗣𝘆𝘁𝗵𝗼𝗻:
- Python Syntax
- Data Types
- Variables
- Operators
- Control Structures:
if-elif-else
Loops
Break and Continue
try-except block
- Functions
- Modules and Packages

𝗢𝗯𝗷𝗲𝗰𝘁-𝗢𝗿𝗶𝗲𝗻𝘁𝗲𝗱 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗶𝗻 𝗣𝘆𝘁𝗵𝗼𝗻:
- Classes and Objects
- Inheritance
- Polymorphism
- Encapsulation
- Abstraction

𝗣𝘆𝘁𝗵𝗼𝗻 𝗟𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀:
- Pandas
- Numpy

𝗣𝗮𝗻𝗱𝗮𝘀:
- What is Pandas?
- Installing Pandas
- Importing Pandas
- Pandas Data Structures (Series, DataFrame, Index)

𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗗𝗮𝘁𝗮𝗙𝗿𝗮𝗺𝗲𝘀:
- Creating DataFrames
- Accessing Data in DataFrames
- Filtering and Selecting Data
- Adding and Removing Columns
- Merging and Joining DataFrames
- Grouping and Aggregating Data
- Pivot Tables

𝗗𝗮𝘁𝗮 𝗖𝗹𝗲𝗮𝗻𝗶𝗻𝗴 𝗮𝗻𝗱 𝗣𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻:
- Handling Missing Values
- Handling Duplicates
- Data Formatting
- Data Transformation
- Data Normalization

𝗔𝗱𝘃𝗮𝗻𝗰𝗲𝗱 𝗧𝗼𝗽𝗶𝗰𝘀:
- Handling Large Datasets with Dask
- Handling Categorical Data with Pandas
- Handling Text Data with Pandas
- Using Pandas with Scikit-learn
- Performance Optimization with Pandas

𝗗𝗮𝘁𝗮 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲𝘀 𝗶𝗻 𝗣𝘆𝘁𝗵𝗼𝗻:
- Lists
- Tuples
- Dictionaries
- Sets

𝗙𝗶𝗹𝗲 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴 𝗶𝗻 𝗣𝘆𝘁𝗵𝗼𝗻:
- Reading and Writing Text Files
- Reading and Writing Binary Files
- Working with CSV Files
- Working with JSON Files

𝗡𝘂𝗺𝗽𝘆:
- What is NumPy?
- Installing NumPy
- Importing NumPy
- NumPy Arrays

𝗡𝘂𝗺𝗣𝘆 𝗔𝗿𝗿𝗮𝘆 𝗢𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀:
- Creating Arrays
- Accessing Array Elements
- Slicing and Indexing
- Reshaping Arrays
- Combining Arrays
- Splitting Arrays
- Arithmetic Operations
- Broadcasting

𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗗𝗮𝘁𝗮 𝗶𝗻 𝗡𝘂𝗺𝗣𝘆:
- Reading and Writing Data with NumPy
- Filtering and Sorting Data
- Data Manipulation with NumPy
- Interpolation
- Fourier Transforms
- Window Functions

𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗡𝘂𝗺𝗣𝘆:
- Vectorization
- Memory Management
- Multithreading and Multiprocessing
- Parallel Computing

I have curated the best resources to learn Python 👇👇
https://whatsapp.com/channel/0029VaiM08SDuMRaGKd9Wv0L

Hope you'll like it

Like this post if you need more resources like this 👍❤️

#Python