Free, human written STEM guides
Kevin’s Guides
Clear, practical tutorials in coding, math, web development, device security, and more.
Learn something new in coding today.
Popular Topics
Featured Guides
Order Precedence (Order of Operations)
Order Precedence tells us the order in which we need to evaluate mathematical equations. It is also widely known as the order of operations. The Order…
Latest
Site Update
After about a year of being away, I’ve started working on Kevin’s Guides again! Wish…
Dec 13, 2025
Recursive npm package install
Here’s a simple script that recursively searches through a folder, finds any instances of package.json,…
Aug 3, 2024
How Retail Phone Stores Work
Learn how retail phone stores operate and how you can avoid wasting some of your…
Jul 27, 2024
Hide ProWritingAid’s Annoying Floating Icon Widget
How to hide the annoying floating ProWritingAid browser extension widget icon which hovers above almost…
Jul 24, 2024
I switched to WordPress
After about a month of effort, I’ve finally converted all the 120+ guides I wrote…
Jul 23, 2024