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Computer basics

Start with the parts and ideas every computer has in common.

What is a computer? The basic parts of a computer and the cycle that turns instructions into useful work. Beginner · 2 min read

Hardware

Understand the components inside a computer and how they work together.

How CPUs work A practical explanation of CPU instructions, cores, clock speed and the work a processor actually does. Beginner · 2 min read What is RAM? Learn what computer memory holds, how it differs from storage and when capacity matters. Beginner · 2 min read DDR4 vs DDR5 The practical differences between two generations of desktop and laptop memory. Beginner · 2 min read What is an SSD? How solid-state storage keeps files, how it compares with a hard drive and what its labels mean. Beginner · 2 min read

Networking

How devices communicate across local networks and the internet.

What is DNS? How the Domain Name System helps a device find a website and why a lookup can fail. Beginner · 2 min read