Bugsy explains

Short reads for the stuff tutorials skip

Pick a page. Every one has toys to poke and a quiz or two.

6 min 3 toys
Semantic versioning
What 2.4.1 really promises, why ^ and ~ let in different updates, and what the keys you'll meet most in package.json are for.
- packages
- javascript
- tooling
8 min 3 toys
What is Docker?
Why "it works on my machine" stops being an excuse: images, containers, how they differ from virtual machines, and why the order of your Dockerfile makes builds fast.
- containers
- devops
- tooling
7 min 1 toy
What happens when you type a URL?
The quarter of a second between pressing Enter and seeing a page: DNS, TCP, TLS, HTTP and rendering, and the caches that let your browser skip most of it next time.
- web
- security
7 min 1 toy
Environment variables and .env
How one build talks to localhost on your laptop and to the real API in production, which source wins when a variable is set twice, and why secrets never get the NEXT_PUBLIC_ prefix.
- devops
- tooling
- security
9 min 1 toy
OAuth, JWT and passkeys: what's the difference?
Three words that get mixed up because they show up in the same login: OAuth lends an app limited access, a JWT is a signed note anyone can read, and a passkey replaces your password with a key that phishing can't steal.
- auth
- security
- web