SQL
Learn databases, queries, joins, aggregations, subqueries, window functions, database design, and real-world SQL.
- Fundamentals
- Working With Data
- Functions
- Aggregation
- JOINs
- Intermediate SQL
Learn SQL62 lessons live · 62 planned
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SELECT c.name, SUM(o.amount) AS total_spent
FROM customers c
JOIN orders o ON o.customer_id = c.customer_id
GROUP BY c.name
ORDER BY total_spent DESC;name | total_spent
-----+------------
Ravi | 560
Asha | 370Start Learning
Structured courses that take you from absolute basics to advanced topics, one clear lesson at a time.
Beginner → Advanced
Python
Learn Python fundamentals, data structures, functions, OOP, files, APIs, projects, automation, and more.
- Fundamentals
- Control Flow
- Data Structures
- Functions
- Intermediate Python
- Object-Oriented Programming
Learn Python60 lessons live · 60 planned
C
Learn C fundamentals, functions, arrays and strings, pointers, memory management, structs, files, and the preprocessor.
- Fundamentals
- Control Flow
- Functions
- Arrays and Strings
- Pointers
- Memory Management
Learn C47 lessons live · 47 planned
C++
Learn C++ fundamentals, functions, arrays and vectors, pointers and memory, OOP, the STL, templates, and modern C++.
- Fundamentals
- Control Flow
- Functions
- Arrays, Strings and Vectors
- References, Pointers and Memory
- Object-Oriented Programming
Learn C++56 lessons live · 56 planned
Java
Learn Java fundamentals, methods, arrays and strings, OOP, the Collections Framework, generics, streams, and modern Java.
- Fundamentals
- Control Flow
- Methods
- Arrays and Strings
- Object-Oriented Programming
- Collections Framework
Learn Java52 lessons live · 52 planned
HTML
Learn HTML elements, text, links, images, lists, tables, forms, semantic layout, media, accessibility, and SEO basics.
- Fundamentals
- Text Content
- Links and Images
- Lists and Tables
- Forms
- Semantic Structure
Learn HTML46 lessons live · 46 planned
CSS
Learn CSS selectors, the cascade, the box model, colors, typography, Flexbox, Grid, responsive design, transitions, and animations.
- Fundamentals
- The Box Model
- Text, Backgrounds and Content
- Layout
- Responsive Design
- Effects and Motion
Learn CSS47 lessons live · 47 planned
JavaScript
Learn JavaScript fundamentals, functions, arrays and objects, the DOM, events, async/await, fetch, classes, modules, and Node.js.
- Fundamentals
- Control Flow
- Functions
- Arrays, Objects and Data
- The DOM and Events
- Asynchronous JavaScript
Learn JavaScript56 lessons live · 56 planned
TypeScript
Learn TypeScript types, interfaces, unions, narrowing, generics, classes, utility types, modules, and tsconfig.
- Fundamentals
- Building Types
- Functions and Classes
- Generics
- Advanced Types
- in Real Projects
Learn TypeScript39 lessons live · 39 planned
DSA
Learn Big O, arrays and hashing, linked lists, stacks and queues, sorting, trees, heaps, graphs, greedy algorithms and dynamic programming.
- Foundations
- Arrays, Strings and Hashing
- Linked Lists
- Stacks and Queues
- Searching and Sorting
- Trees and Heaps
Learn DSA47 lessons live · 47 planned
Python for Data
Learn NumPy, pandas, data cleaning, grouping and pivot tables, time series, statistics, hypothesis and A/B testing, and charts with matplotlib and seaborn.
- Getting Started
- NumPy
- pandas Basics
- Cleaning Data
- Analysing Data
- Statistics for Data Analysis
Learn Python for Data42 lessons live · 42 planned
React
Learn React components, JSX, props, state, events, forms, effects, data fetching, context, custom hooks, performance, TypeScript, routing and testing.
- Getting Started
- Interactivity
- Effects and Hooks
- Patterns and Performance
- Building Real Apps
- Projects
Learn React31 lessons live · 31 planned
Node.js and Express
Learn Node.js and Express: modules, npm, files, streams, the event loop, HTTP servers, routing, middleware, validation, REST APIs, databases, authentication, security, testing and deployment.
- Getting Started
- Core Node.js
- Express
- Building APIs
- Authentication and Security
- Testing and Production
Learn Node.js and Express31 lessons live · 31 planned
Machine Learning
Learn regression, classification, trees and boosting, model evaluation, clustering and PCA, neural networks with PyTorch, text and embeddings, LLM APIs, and deploying models.
- Foundations
- Regression
- Classification
- Building Better Models
- Unsupervised Learning
- Deep Learning with PyTorch
Learn Machine Learning38 lessons live · 38 planned
Git and GitHub
Learn commits, branches, merging and conflicts, GitHub, pull requests, team workflows, GitHub Actions, rebase, reset and the reflog, and how Git works inside.
- Getting Started
- Branching and Merging
- Working with GitHub
- Team Workflows
- Advanced Git
- Projects
Learn Git and GitHub34 lessons live · 34 planned
Linux and Bash
Learn the Linux command line, files, grep, sed and awk, permissions, processes, systemd, SSH, cron and Bash scripting, from your first command to safe automation.
- Getting Started
- Searching and Text Tools
- Using a Linux System
- Networks and Servers
- Bash Scripting
- Projects
Learn Linux and Bash37 lessons live · 37 planned
Docker and Kubernetes
Learn containers, images, Dockerfiles, volumes, networks, Docker Compose, security and CI/CD, then Kubernetes pods, deployments and services.
- Getting Started
- Building Images
- Data and Networks
- Docker Compose
- Containers in Production
- Kubernetes Basics
Learn Docker and Kubernetes30 lessons live · 30 planned
System Design
Learn how large systems are built: estimation, scaling, load balancing, caching, databases, sharding, queues, reliability, and worked designs for popular interview questions.
- Foundations
- Building Blocks
- Case Studies
- Interview Questions
Learn System Design27 lessons live · 27 planned
Choose Your Learning Path
- Complete BeginnerNever coded before? Start here. Python's first lessons assume no experience at all.Start from zero
- Interview PreparationPractise common programming and database interview questions, with hints and full answers.Prepare for interviews
- PracticeSolve exercises and improve by writing code, sorted by topic and difficulty.Start practising
- Quick ReferenceUse cheat sheets when you need an answer quickly, without reading a full lesson.Open cheat sheets
Popular Lessons
Good places to start, or to fill a gap.
- SQLSQL LEFT JOIN Explained Simply (With Diagrams and Examples)Learn SQL LEFT JOIN with clear diagrams and examples. Keep every row from the left table, understand NULLs in the result, find rows with no match, and avoid the WHERE-clause trap.Intermediate11 min read
- PythonPython Variables: How to Store and Use ValuesLearn Python variables from scratch: how to create and update them, naming rules, multiple assignment, f-strings, and the beginner mistakes to avoid. Includes exercises.Beginner8 min read
- C++C++ Pointers Explained: Addresses, Dereferencing, nullptr and Pointer ArithmeticLearn C++ pointers step by step: memory addresses with &, declaring pointers, dereferencing with *, nullptr, pointers and arrays, pointer arithmetic, const and pointers, pointers to structs with ->, and common pointer bugs.Intermediate10 min read
- JavaJava HashMap and TreeMap: Key-Value Pairs, Counting and GroupingLearn Java maps: HashMap put, get, getOrDefault, containsKey and remove, iterating with entrySet and forEach, counting with merge, grouping with computeIfAbsent, TreeMap for sorted keys and range queries, LinkedHashMap for insertion order, and how hashing works.Intermediate11 min read
- SQLSQL GROUP BY Explained Simply (With Examples)Learn how SQL GROUP BY turns many rows into summary rows. Count, sum, and average per group, group by multiple columns, filter groups with HAVING, and avoid common errors.Beginner8 min read
- PythonPython Lists: Create, Access, Change and Loop (Beginner Guide)Everything a beginner needs to know about Python lists: creating lists, indexing and slicing, adding and removing items, sorting, looping, and the most common list mistakes.Beginner10 min read
- C++C++ std::vector: Dynamic Arrays Explained with ExamplesLearn std::vector, C++'s most used container: creating vectors, push_back and emplace_back, accessing with [] and at(), size and capacity, inserting and erasing, sorting, removing elements safely, vectors of strings and objects, and passing vectors to functions.Beginner12 min read
- JavaJava Classes and Objects: Fields, Methods, new and thisLearn Java classes and objects: defining a class with fields and methods, creating objects with new, references and null, instance vs static members, the this keyword, toString, and how objects behave when assigned and compared.Intermediate12 min read
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