BrainlagCode

Learn

Four tracks, 55 lessons. Each starts with a free Foundations module, then Core and Advanced. Go in order; the checker is the only one grading you.

Python

The friendly one · 15 lessons Track map

Foundations Free

6 lessons · about 2 h
01 Your first line of Python 02 Variables are name tags 03 Numbers and arithmetic 04 Strings, slices and f-strings 05 input() and type conversion 06 Making decisions with if

Core Premium

5 lessons · about 1.5 h
07 Repeating with while 08 for loops and range() 09 Lists hold many things 10 Functions, and return vs print 11 Dictionaries map keys to values

Advanced Premium

4 lessons · about 1.5 h
12 Reading errors and debugging 13 Handling errors with try and except 14 Classes: make your own types 15 Bug hunt: fix code you did not write

JavaScript + HTML/CSS

Make things people can click · 14 lessons Track map

Foundations Free

5 lessons · about 1.5 h
01 HTML: tags, elements and nesting 02 CSS: selectors, colour, fonts and classes 03 The box model and flexbox 04 console.log, values and types 05 let, const and template literals

Core Premium

5 lessons · about 1.5 h
06 if, else and comparing things 07 Loops: doing things again 08 Functions and return 09 Arrays and their methods 10 Objects: grouping data

Advanced Premium

4 lessons · about 1.5 h
11 The DOM: changing the page with JavaScript 12 Events: making buttons do things 13 Forms: reading what people type 14 Bug hunt: fix code you did not write

SQL

Ask data questions · 13 lessons Track map

Foundations Free

5 lessons · about 1.5 h
01 Tables and your first SELECT 02 Picking columns and naming them 03 Filtering rows with WHERE 04 AND, OR, IN, BETWEEN and LIKE 05 Sorting with ORDER BY and LIMIT

Core Premium

5 lessons · about 1.5 h
06 NULL, the value that isn't there 07 Counting and adding up 08 GROUP BY and HAVING 09 Joining two tables 10 LEFT JOIN and the missing matches

Advanced Premium

3 lessons · about 1 h
11 INSERT, UPDATE and DELETE 12 Queries inside queries 13 Bug hunt: fix code you did not write

C

How computers actually work · 13 lessons Track map

Foundations Free

4 lessons · about 1.5 h
01 Hello, compiler 02 Variables are bytes 03 Numbers are just bits 04 Decisions and loops

Core Premium

4 lessons · about 1.5 h
05 Functions and the stack 06 Arrays in memory 07 Strings are char arrays 08 Pointers and addresses

Advanced Premium

5 lessons · about 2 h
09 Pass by value, pass a pointer 10 Pointer arithmetic 11 Structs and padding 12 The heap and malloc 13 Bug hunt: fix code you did not write

Foundations is free in every track, for good. Core, Advanced and the four bigger projects come with Premium, £7.99 a month or £59 a year. Free and Premium compared