CodePrimer
Search a living directory of web syntax. Pick a problem, copy a working sample, then adapt it.
SQL
Beginner
CREATE DATABASE
How do I create a MySQL database?
JavaScript
Beginner
document.getElementById
How do I select one element by id?
PHP
Beginner
Embed PHP inside HTML
How do I mix PHP and HTML?
HTML
Beginner
HTML headings h1–h6
How do I create page headings?
CSS
Beginner
Three ways to apply CSS
What are inline, internal, and external CSS?
SQL
Intermediate
ALTER TABLE add column
How do I add a column to an existing table?
CSS
Beginner
CSS box model
Why is my element wider than expected?
JavaScript
Beginner
document.querySelector
How do I select with a CSS selector?
HTML
Beginner
Paragraphs and line breaks
How do I break text into paragraphs?
PHP
Beginner
PHP comments
How do I write comments in PHP?
JavaScript
Beginner
document.querySelectorAll
How do I select every matching element?
SQL
Intermediate
Foreign key relationship
How do I relate posts to users?
HTML
Beginner
Hyperlinks with href
How do I make a clickable link?
CSS
Beginner
Margin vs padding
What is the difference between margin and padding?
PHP
Beginner
PHP variable rules
What are the rules for PHP variables?
JavaScript
Beginner
addEventListener click
How do I make a button show an alert?
SQL
Intermediate
COUNT with GROUP BY
How do I count rows per category?
CSS
Beginner
display block inline flex
How does display change layout?