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Computer foundations

No security yet. How computers, files, networks and the web actually work, so everything later has something to stand on.

1. 01What cybersecurity actually isAssets, attackers, and the three things we protect.7 min
2. 02How a computer runs a programCPU, memory, disk and the operating system, in one picture.6 min
3. 03Files, folders and permissionsWho can read, write and run what, and how to read a permission string.7 min
4. 04Your first terminal commandsMove around, look at files, and read what a command did.7 min
5. 05Processes and memoryWhat is running right now, and what each running thing can touch.7 min
6. 06Users, accounts and admin rightsWhy 'run as administrator' matters.7 min
7. 07How the internet moves dataIP addresses, ports and packets.6 min
8. 08DNS: names to addressesHow agentbeam.com becomes a machine you can reach.7 min
9. 09HTTP by handSend a web request yourself and read the reply.7 min
10. 10Software, versions and updatesWhy version numbers are security information.7 min
11. 11Reading logsThe record a system keeps, and how to read it.9 min