D3VISRI

# Backend Engineering Fundamentals: The Master Checklist

## Pillar 1: The Internet & Communication
The foundational rules of how data moves across the web.

* **HTTP/HTTPS Lifecycle**
  * **DNS Resolution:** How a domain name (like `google.com`) is translated into an IP address.
  * **TCP Handshake:** The 3-way handshake (SYN, SYN-ACK, ACK) that establishes a reliable connection.
  * **TLS/SSL Handshake:** How HTTPS encrypts data in transit to prevent packet sniffing.
  * **The Request/Response Cycle:** The anatomy of an HTTP request (Method, Headers, Body) and response (Status Code, Headers, Body).