🔬 How It Actually Works

Deep dives into the tools you use every day

Every Saturday
  1. #12

    How Git Merge vs Rebase Actually Works (With Visual Examples)

    Merge creates a commit. Rebase rewrites history. Here's what actually happens to your commits with each approach, when to use which, and why teams fight about it.
  2. #11

    How Embeddings Work — The Math Behind Semantic Search, Explained Simply

    Embeddings turn text into numbers that capture meaning. Here's how they work, why 'king - man + woman = queen', and how to use them in your apps.
  3. #11

    How Docker Networking Actually Works Under the Hood

    Bridge, host, overlay, none — Docker networking modes explained with diagrams and real examples. Why your containers can't talk to each other, and how to fix it.
  4. #11

    How SSH Actually Works Behind the Scenes

    You type ssh user@server and you're in. Here's what actually happens: key exchange, authentication, channels, and why it's so secure.
  5. #10

    How Tokenizers Work — Why 'strawberry' Has 3 Tokens

    Tokenizers split text into pieces AI models understand. BPE, SentencePiece, tiktoken — how they work, why they matter, and why token counts surprise you.
  6. #10

    How DNS Resolves a Domain Name (The Full Journey)

    When you type a URL, your browser doesn't know where to go. DNS translates the domain to an IP address. Here's every step of that journey.
  7. #9

    How Hot Reload Actually Works Under the Hood

    You save a file and the browser updates instantly. Here's what actually happens: file watchers, module graphs, HMR protocols, and why it sometimes breaks.
  8. #8

    How JWT Actually Works (And Why It's Not Encryption)

    JWTs are everywhere in modern auth. Here's what's actually inside them, how signing works, and the security mistakes most developers make.
  9. #7

    How WebSockets Actually Work Behind the Scenes

    WebSockets aren't magic. Here's exactly what happens during the handshake, how frames are structured, and why they're different from HTTP.
  10. #6

    How CORS Actually Works (And Why Your Request Gets Blocked)

    CORS errors are the most frustrating part of web development. Here's exactly what the browser does, why preflight requests exist, and how to fix it properly.
  11. #5

    How React's Virtual DOM Actually Works

    React doesn't update the real DOM directly. It diffs a virtual copy first. Here's the reconciliation algorithm explained simply.
  12. #4

    How HTTPS Actually Keeps Your Data Safe

    HTTPS isn't magic. It's a handshake, a key exchange, and symmetric encryption. Here's the full process in plain English.
  13. #2

    How Git Tracks Your Changes (It's Not What You Think)

    Git doesn't store diffs. It stores snapshots. Here's how Git actually works under the hood — blobs, trees, commits, and refs.
  14. #1

    How npm install Actually Works Behind the Scenes

    Ever wondered what happens when you run npm install? Here's the full process: resolution, fetching, linking, and why it sometimes breaks.