Coding guides
Learn to read and write code, one line at a time
Each beginner lesson starts with plain-language meaning, then shows a short example you can follow. You will see how markup, styling, and simple scripts fit together.
Where to begin
Three foundations for beginners
Start with structure, move to simple scripts, then build the habit of checking your own work.
Structure
HTML and CSS basics
Learn how a page is built from elements, and how styling rules change how those elements look.
Logic
Scripting fundamentals
Follow small scripts that store values, make decisions, and repeat simple steps.
Habits
Debugging habits
Read error messages calmly, locate the line that matters, and confirm each fix before moving on.
How we work through it
A method for every beginner exercise
01
Isolate the problem
Narrow the issue to one small part of the script, so you know exactly where to look.
02
Test the line
Change one line at a time and run the code again to see what that single change does.
03
Verify the output
Compare what the program prints or displays with what you expected, then note what you learned.