How computers and networks work.
Almost everything in IT sits on two ideas: a computer follows instructions, and computers talk to each other over networks. If you understand how a machine stores and processes information, and how it finds and reaches another machine, most other topics become easier to place.
The entries in this area start inside the machine, with processors, memory and storage, then move outward to files, operating systems, the internet, IP addresses, DNS and the web. The last entries are practical: setting up a home network and using the command line.
Who it helps: Start here if words like “router”, “IP address” or “operating system” still feel fuzzy, or if you want a base before learning to code.
Computing and Networks
Learn what the CPU, memory (RAM) and storage do, how they work together when you open a file, and why a computer feels slow when one of them runs short.
Updated October 30, 2026
Computing and Networks
An operating system manages hardware, runs programs and keeps them apart. Learn its main jobs, what the kernel does, and where Windows, macOS and Linux fit.
Updated October 30, 2026
Computing and Networks
Learn what a file, a folder and a file system are, how paths and extensions work, and why drives are formatted, using a simple trip-planning example.
Updated October 30, 2026
Computing and Networks
See the big picture of the internet: networks joined together, providers, packets, routers and servers, and how data travels from your device to a website.
Updated October 30, 2026
Computing and Networks
An IP address is the number that lets devices find each other on a network. Learn IPv4 and IPv6, public and private addresses, and how to find yours.
Updated October 30, 2026
Computing and Networks
DNS turns a name like example.com into the IP address a computer needs. Learn how a lookup works, what caching does, the main record types and common problems.
Updated October 30, 2026
Computing and Networks
Follow a web page from the moment you press Enter: the URL, the HTTPS connection, the request and response, status codes and how the browser builds the page.
Updated October 30, 2026
Computing and Networks
Learn the difference between a modem and a router, how Wi-Fi fits in, how to secure your home network step by step, and how to fix common connection problems.
Updated October 30, 2026
Computing and Networks
Learn what the command line is, how to open it on Windows, macOS and Linux, and how to check your location, list files and change folders with safe commands.
Updated October 30, 2026