Code

A short history of JavaScript

Set up your computer

JavaScript

The language of the web. Make things happen — runs right in your browser.

15 Lessons

Course overview and progress →

What JavaScript is used for

Variables — let and const

Run JavaScript anywhere

console.log and comments

Numbers and maths

Strings

Template literals

Booleans and comparisons

C Programming

From printf to pointers, memory, and data structures — write in your browser and compile and run on our servers.

23 Lessons

Course overview and progress →

C basics: main, printf, and functions

Variables, types, and arithmetic

Booleans and selection: if, else, switch

Loops: while, for, and accumulation

Functions, parameters, and return values

Nested loops and patterns

1-D arrays: store, index, and traverse

Pointers: &, *, and pass-by-pointer

Strings: char arrays and the null terminator

Array algorithms: max, count, search, average

2-D arrays: working with a grid

Searching: linear and binary

Sorting: bubble, selection, and insertion

Recursion: base case and recursive case

Structs and typedef: . vs ->

Dynamic memory: malloc, free, and realloc

Linked lists

Stacks and queues (array-backed)

Text files: write then read

Error handling with return codes

Bits, binary, and bitwise operators

Run-length encoding (compression)

Preprocessor, const, static, and enum

Web Basics — HTML & CSS

Start from zero. Short steps. Build a real web page.

21 Lessons

Course overview and progress →

A short history of the web

What a web page is made of

What you need (almost nothing)

Your first web page

Headings and paragraphs

Bold, italic and line breaks

Comments and neat nesting

Selectors — class and id

Colours and backgrounds

Styling text

The box model

Spacing — margin and padding

Showing and hiding (display)

Width and centering

Rows with Flexbox

Mini-project: a profile card

Exam courses

Python for IGCSE CS

Programming, algorithms, databases and logic for Cambridge IGCSE 0478.

14 Lessons

Course overview and progress →

Sequence, input & output

Variables, constants & data types

Selection — IF and CASE

Iteration — loops

Totalling & counting

Procedures & functions

Validation & verification

1-D arrays (lists)

2-D arrays

Searching & max / min

Bubble sort

Text files

Databases & SQL

Boolean logic & truth tables

IGCSE CS Pseudocode

Write and run the pseudocode in the Cambridge IGCSE 0478 syllabus for 2026, 2027 and 2028.

19 Lessons

Course overview and progress →

OUTPUT and sequence

Variables, DECLARE and CONSTANT

INPUT and data types

Arithmetic, DIV and MOD

Selection: IF

Selection: CASE

Iteration: FOR

Iteration: WHILE and REPEAT

ROUND, RANDOM and a trace

Bubble sort

Python for A-Level CS

Data structures, algorithms, and OOP for Cambridge 9618.

15 Lessons

Course overview and progress →

Nested loops & 2-D lists

Inheritance & encapsulation

Programming paradigms

Hash tables

Binary search trees

Graphs

AS-level CS Pseudocode

Cambridge 9618 pseudocode, from basics to exam questions.

30 Lessons

Course overview and progress →

Optional entry diagnostic

OUTPUT and sequence

Variables and DECLARE

Types and constants

Arithmetic, DIV and MOD

Selection: IF

Selection: CASE

Iteration: FOR

Iteration: WHILE and REPEAT

Linear search and bubble sort

Built-in functions from the insert

Logic: AND, OR, NOT

Putting it together

Read a scenario and plan an algorithm

Choose loops and validate input

Combine arrays, strings and searches

Design subroutines and parameter contracts

Build reports from records and text files

Trace, diagnose and repair algorithms

Refine designs and choose test data

Solve a multipart tournament scenario

Exam workshop: plan, answer and review

Independent assessment A: parcel dispatch

Independent assessment B: equipment inspections

Python for AP CS Principles

Big ideas of computing — data, algorithms, the Internet, and impact.

15 Lessons

Course overview and progress →

What computing is

Bits and binary

Data compression

Variables and expressions

Lists and data abstraction

Selection

Iteration

Procedures and abstraction

Algorithms: searching

Randomness and simulation

Algorithmic efficiency

The Internet and how data travels

Parallel and distributed computing

Impact of computing

The Create Performance Task (guided)

Java for AP CS A

Java programming for the AP Computer Science A exam.

19 Lessons

Course overview and progress →

A short history of Java

What Java is used for

Java basics: classes, main, and output

Set up your computer

Using objects: String, Math, and wrappers

Booleans and selection: if/else and logic

Loops: while, for, and accumulation

Strings and nested loops

Writing a class: fields, constructor, methods

Encapsulation: private fields, getters, setters

1-D arrays: store, index, and traverse

Array algorithms: max, count, search, average

ArrayList: a list that grows

ArrayList algorithms: filter and the remove bug

2-D arrays: working with a grid

Searching: linear and binary

Sorting: selection and insertion sort

Recursion: base case and recursive case

Text files: write and read with Scanner

Inheritance: extends, super, and overriding

Polymorphism: dynamic dispatch and toString()

FRQ workshop: the 4 question types

Topics & tools

Databases & SQL

Query, design, and change relational databases — right in your browser, no setup.

17 Lessons

Course overview and progress →

A short history of SQL

Sorting with ORDER BY

Counting and averaging

LIKE, IN and BETWEEN

Grouping with GROUP BY

Tables, keys and relationships

Linux & the command line

Drive a computer by typing. Practise real shell commands in a safe in-browser terminal.

14 Lessons

Course overview and progress →

What is Linux?

Why learn the command line?

Helpful resources

Get a real terminal

The shell and the prompt

Moving around

Reading files

Creating and removing

Wildcards

Saving output to files

Pipes — joining commands

Searching with grep

Finding files with find

Sorting and columns

File permissions

Users and sudo

Programs and processes

Software, settings, next steps

LaTeX

Typeset beautiful documents and maths — write LaTeX, compile on our servers, see the PDF.

14 Lessons

Course overview and progress →

What is LaTeX?

Where LaTeX is used

Helpful resources

Use LaTeX on your own computer

Your first document

Sections and titles

Bold, italic and emphasis

Bulleted and numbered lists

Maths — your first formula

Fractions, roots and sums

Aligning equations

Tables

Drawing with TikZ

Labels and cross-references

Citations and bibliography

Page layout and margins

Colour and links

Capstone: a one-page report

Cyber security

How attacks work and how to stop them — ciphers, hashing, and safe computing, hands-on.

16 Lessons

Course overview and progress →

What is cyber security?

Why it matters

Helpful resources

Nothing to install

Security, privacy and integrity

Malware

Attacks and brute force

Social engineering

Defending a system

Passwords and authentication

Storing passwords safely

Encoding is not encryption

Symmetric encryption

Asymmetric encryption

Hashing and digital signatures

HTTPS, SSL/TLS and certificates

Data integrity

SQL injection

Access control and least privilege

Ethics, law and staying safe

Practice

Practise programming and Cambridge pseudocode with challenges from 1★ to 5★. Choose a track.

Pseudocode practice

Choose your exam: IGCSE 0478 or AS 9618. Their notation differs.

Print a bigger number

Multiply two variables

Use what it gives back

Flatten a nested list

FizzBuzz with 4 and 6

Sieve of Eratosthenes

★★★★★

A row of Pascal's triangle

Positive, negative or zero

The loop that never ends

Double until it passes 100

Stop at the first over fifty

A row of the times table

The first three letters

Add two numbers you were given

Each letter on its own line

101

Reverse the word order

Most frequent character

Binary search

Factorial (mind the size)

Longest common prefix

Multiply two variables

Greatest common divisor

Largest of three readings

Menu command

Multiples up to a limit

Validate a percentage

Reverse a word

Count a selected character

Extract an identifier

Array average

Greatest negative value

Reusable output procedure

First matching position

Clamp a value

Count text-file lines

Validate a four-digit PIN

Repair the last-item bug

Largest of three readings

Choose boundary tests

Stock-order processing

Menu command

Multiples up to a limit

Validate a percentage

Reverse a word

Count a selected character

Extract an identifier

Array average

Greatest negative value

Reusable output procedure

First matching position

Clamp a value

Count text-file lines

Records: highest mark

Repair the last-item bug