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Operating Systems Explained for Beginners
Learn what an operating system does between hardware and applications: managing memory, processes, storage, devices and security, in plain language.
Systems and Infrastructure
Operating Systems and Servers
How computers and servers run, are managed and are kept up to date.
A Plain Guide to Command Line Basics
Why people type commands instead of clicking, how a shell works, and a handful of simple, safe examples for navigating folders and working with files.
How File Systems Organize Your Data
See how file systems divide storage into files, folders and permissions, what metadata and formatting mean, and why different systems suit different uses.
Managing Startup Programs and Background Services
Find out what runs in the background of a computer, why too many startup programs and services slow it down, and how to review them carefully.
Reading Logs to Find Out What Went Wrong
Learn how system and application logs record events, what a typical entry contains, and how to read them step by step to trace a problem to its cause.
Server Basics for Non-Specialists
A plain explanation of what servers are, the common roles they play, how they differ from desktop computers, and why organizations rely on them.
Understanding Patch Management and Software Updates
Why software updates matter, what patch management involves, and how organizations inventory, test, schedule and verify updates while limiting disruption.
What Virtual Machines Are and When People Use Them
Understand how virtual machines run several isolated systems on one physical computer, what a hypervisor does, and the common reasons people use them.
Windows, macOS and Linux Compared in General Terms
A balanced, general comparison of the three major desktop operating system families: design, typical users, software, customization, security and cost.
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