AI for Programmers
Common Problems With AI-Generated Code
Eight failure patterns that show up in generated code, what each looks like, and the specific check that catches it before it…
All guides
Every guide on the site, newest first. Explanations, projects and fixes written in plain English.
Java
Object-Oriented Programming (OOP) in Java
Classes, objects, encapsulation, inheritance and polymorphism in Java — what each one is actually for, with small examples rather than animal metaphors.
Web Development
What Is an API? A Plain-English Explanation
An API is a set of requests one program agrees to answer for another. What that means in practice, how to read…
Web Development
Working with Databases: A Beginner’s Introduction
What a database is, the SQL you actually need, and the one rule about building queries that separates safe code from a…
Web Development
CSS Grid Explained
Grid lays out rows and columns at the same time. Here is the fr unit, repeat and auto-fit, named areas, and the…
Java
Java Basics for Beginners
Java’s structure, types, control flow and the class-and-main-method boilerplate — explained so the ceremony makes sense rather than getting in the way.
Web Development
CSS Flexbox Explained
Flexbox lays items out in one direction. Once you understand the main axis, justify-content and align-items stop being guesswork — here is…
Python
Handling Warnings in Python
What Python warnings mean, how to see them all, silence the ones you have decided about, and turn the dangerous ones into…
PHP
Arrays and Data Structures in PHP
PHP arrays are both lists and dictionaries. How indexed and associative arrays differ, the functions worth knowing, and when to reach for…
Coding Tools
Command Line Basics for Beginners
The dozen terminal commands every programming tutorial assumes you already know — moving around, listing files, running programs, and what "is not…
JavaScript
Client-Side Web APIs in JavaScript
The browser APIs your JavaScript can use directly — fetch, storage, geolocation, clipboard, observers — and how to use each without breaking…
Coding Tools
Git Branching for Beginners
What a branch actually is, the four commands you need, how to merge, and how to get out of a merge conflict…
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