Plain Library

A Plain Approach to Complex Ideas

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The library

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A plain approach to the key concepts and foundations that drive the tech industry today, all explained clearly and accessibly.

01

Simple Concepts

Focused introductions to the essential building blocks used across systems, software, and the web.

Regular Expressions

Regex

Defines patterns used to identify, extract, or validate specific character sequences within text.

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Docker Containers

Docker

Builds, packages, and runs applications in lightweight, portable containers.

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Filesystem Metadata

Inodes

Stores file metadata such as ownership, permissions, size, and disk block locations.

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Structured Data

XML

A flexible, human-readable format for storing and transporting structured data.

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Web Requests

HTTP Methods

The request methods used to retrieve, create, update, and remove web resources.

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Data Protection

Encoding & Encryption

How information is represented for compatibility and protected for confidentiality.

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02

Complex Topics

Broader systems where identity, infrastructure, telemetry, and security controls work together.

Directory Services

AD Basics

A clear map of Active Directory: forests, domains, identities, authentication, policy, permissions, and hardening.

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Security Monitoring

SIEM Basics

How security platforms collect, correlate, and investigate events across an environment.

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A space to discover & learn

A Space to Discover & Learn

This page is a place where anyone can come to discover and learn the basics of the most relevant concepts in the tech industry — completely free of cost. Whether you’re just starting out or brushing up on fundamentals, the goal is to offer clear, accessible, and well-organized knowledge to empower curious minds and future innovators alike.

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