Python
Web Scraping and Automation
How to scrape a web page with Python responsibly: requests and BeautifulSoup, reading robots.txt, rate limiting, and when to use an API…
All guides
Every guide on the site, newest first. Explanations, projects and fixes written in plain English.
JavaScript
Practical Uses of One-Line If Else Statements in JavaScript
The ternary operator, logical AND and OR, and the nullish coalescing operator — what each one-liner is genuinely good for, and when…
Programming Basics
Big O Notation Explained
Big O describes how the time a piece of code takes grows as its input grows. The six classes you will meet,…
Programming Basics
Functions and Functional Programming
What functions really are, what makes one pure, and the functional ideas — map, filter, reduce, immutability — that make everyday code…
Machine Learning
Transformer Models Explained for Programmers
The architecture behind every modern language model, explained without the maths: tokens, embeddings, attention, and why it replaced everything before it.
Python
Python Recursion Error: Fixing Maximum Depth Exceeded
RecursionError means your function called itself too many times. Here is how to find the missing base case, when to raise the…
AI for Programmers
GitHub Copilot Not Working in VS Code (“Language Model Unavailable”)
Copilot stopped suggesting, chat says the language model is unavailable, or the extension will not sign in? The causes in order of…
Python
Python Dictionary Key Checking with in
How to check whether a key exists in a Python dictionary, why the in operator beats has_key and try/except, and when .get()…
C#
C# Not Working in VS Code (IntelliSense, Errors, Running)
No IntelliSense, no red squiggles, or F5 does nothing for a C# project in VS Code? The fix is the SDK, the…
PHP
PHP Security Best Practices
The security work that actually matters in PHP: prepared statements, output escaping, CSRF tokens, password hashing, file uploads and session handling.
C#
What’s New in C# 14 and .NET 10
.NET 10 is the current long-term release and C# 14 comes with it: extension members, the field keyword, file-based apps and more.…
Python
Conductance: Graph Community Detection in Python
What graph conductance measures, why a low score means you have found a real community, and how to compute it in Python…
Keep going — pick your next guide
The fastest way to improve is to read one guide, then build the thing it describes. Start with the basics, or jump straight to a project.