React
useEffect and Fetching Data From a Real API
useEffect is how a component reaches outside itself — timers, subscriptions, and fetching data from a real backend.
Tutorials
All tutorials
React
Rendering Lists and Handling Events in React
Almost every real UI is a list of something — this is how React renders arrays and reacts to clicks and input.
React
Props and the useState Hook: Making Components Interactive
Props flow data down into a component; state is the memory a component keeps for itself and can change over time.
React
What Is React, and Why Does Everyone Build Components?
React lets you build a UI out of small, reusable pieces instead of one giant tangle of markup and jQuery.
Python
Reading and Writing Files in Python
Reading and writing files in Python is refreshingly painless, as long as you know why the with block matters.
Python
Writing Functions in Python (and Why You Will Want To)
The moment copy-pasting the same lines for the third time stops being okay is usually the moment you need a function.
Python
Making Decisions and Repeating Things in Python
How Python makes decisions and repeats work, and why range(5) never gives you what you first expect.
Python
Lists, Tuples and Dictionaries: Python's Everyday Containers
Lists, tuples and dictionaries all hold groups of values, but each one is built for a slightly different job.
Python
Python Variables and the Basic Types You Will Use Constantly
How Python variables actually work, why there's no type keyword, and one division gotcha that catches everyone once.