</>CodeAtlas

Original, plain-language courses for learning to code — 39 languages, frameworks, and tools, one small lesson at a time, with real code examples and live results.

Courses

<html>

HTML

Structure your content with elements, attributes, forms, semantic tags, media, and more.

16 lessons
{ css }

CSS

Style your pages: selectors, the box model, flexbox, grid, animations, and responsive design.

15 lessons
function()

JavaScript

Add behavior: variables, arrays, objects, events, async/await, and the DOM.

16 lessons
SELECT

SQL

Query real data: filtering, sorting, aggregating, joins, subqueries, and views.

14 lessons
git

Git

Track changes and collaborate: repositories, commits, branching, merging, and remotes.

9 lessons
>>>

Python

A readable, general-purpose language for scripting, data, and everything in between.

12 lessons
class Main

Java

Statically typed and object-oriented: the backbone of Android apps and enterprise backends.

12 lessons
int main()

C

The language most software is built on or descended from: types, pointers, and manual memory.

12 lessons
class {}

C++

C's close-to-the-hardware model plus classes, references, and a standard library of containers.

12 lessons
using System;

C#

A modern, statically typed language for building anything from web apps to games.

12 lessons
<?php

PHP

The server-side language quietly running WordPress, Wikipedia, and a huge share of the web.

12 lessons
: string

TypeScript

JavaScript plus a type system: catch whole categories of bugs before your code ever runs.

12 lessons
func main()

Go

A simple, fast, compiled language built for backends and cloud tooling, with concurrency built in.

12 lessons
fn main()

Rust

Memory safety without a garbage collector, enforced entirely at compile time through ownership.

12 lessons
#!/bin/bash

Bash

Automate your terminal: variables, loops, arguments, and real scripts that get real work done.

12 lessons
urls.py

Django

Python's batteries-included web framework: models, the ORM, the admin site, and authentication.

10 lessons
np.array()

NumPy

Fast, vectorized array math in Python — the foundation nearly every data library is built on.

8 lessons
df.head()

Pandas

Load, clean, filter, and analyze real datasets in Python with the DataFrame, row by row and column by column.

8 lessons
scipy.optimize

SciPy

Optimization, statistics, and linear algebra built on top of NumPy for real scientific computing.

6 lessons
∑

Data Science

The workflow and statistical thinking behind analyzing data, independent of any one library.

10 lessons
  AI  

Artificial Intelligence

A concept-first tour of AI: search, machine learning, neural networks, NLP, vision, and ethics.

10 lessons
gen()

Generative AI

How large language models and image generators actually work, plus real prompt engineering.

8 lessons
> summary()

R

The language built for statistics: vectors, data frames, and plotting real results.

10 lessons
<App />

React

Build UIs out of components: props, state, hooks, and the patterns behind most modern frontends.

10 lessons
require()

Node.js

JavaScript outside the browser: the file system, HTTP servers, npm, and a real REST API.

10 lessons
$(...)

jQuery

Selectors, DOM manipulation, effects, and AJAX — plus an honest take on when to still use it.

8 lessons
*ngFor

Angular

A full TypeScript framework: components, services, routing, and dependency injection.

10 lessons
ng-model

AngularJS

The original 1.x framework — directives, $scope, and controllers, still running in older codebases.

8 lessons
v-model

Vue

A reactive, approachable framework: directives, components, and props, from templates to hooks.

10 lessons
.container

Bootstrap

The grid system, buttons, forms, navbars, and cards behind a huge share of the web's layouts.

10 lessons
$variable

Sass

CSS with variables, nesting, and mixins — and the exact compiled CSS each feature produces.

8 lessons
InnoDB

MySQL

What's specific to MySQL beyond standard SQL: data types, engines, privileges, and backups.

10 lessons
JSONB

PostgreSQL

Window functions, CTEs, JSONB, and the features that set Postgres apart from standard SQL.

10 lessons
{ _id }

MongoDB

The document database model: collections, queries, the aggregation pipeline, and schema design.

10 lessons
S3

AWS

Cloud fundamentals: IAM, S3, EC2, Lambda, and the services behind most production infrastructure.

10 lessons
[HttpGet]

ASP.NET

Microsoft's C# web framework: routing, controllers, Razor views, and building a real Web API.

8 lessons
fun main()

Kotlin

A modern JVM language built for Android: null safety, data classes, and concise functional syntax.

10 lessons
guard let

Swift

Apple's language for iOS and macOS: optionals, value vs. reference types, and protocols.

10 lessons
</>

XML

Self-describing markup: elements, namespaces, DTDs, XPath, and how it compares to JSON.

8 lessons