Web Development

If you have worked with TLS certificates, you may have encountered files with the extensions .pem, .crt, and .key. You might be wondering what they are, what differences they have, and how to use them effectively. The good news is that these formats aren’t as complicated as they seem once you understand the basics: PEM, CRT, and KEY are not different certificate types — they are different ways of packaging the same data. ...

Authentication on the web often feels confusing not because it is complicated, but because its core ideas are rarely explained in a clean order. This post builds that order. We will start from the nature of the web itself, explain cookies and server-side sessions as a single coherent model, then expand outward to JWT and why it fits modern distributed systems. The goal is not to overwhelm you, but to give you a mental model you can reuse. ...