Plain Library

Concepts Simplified

Clear, concise notes on cybersecurity and technology for beginners, curious learners, and anyone needing a quick reference.

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The library

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A growing collection of personal notes on cybersecurity and technology, organized for quick reference and explained clearly for anyone starting out.

All Concepts

Browse all topics alphabetically, from core concepts to broader systems.

Directory Services

AD Basics

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

Network Infrastructure

DNS

How the Domain Name System translates names into IP addresses through resolvers, servers, records, and caching.

Docker Containers

Docker

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

Endpoint Security

EDR Basics

How endpoint detection and response tools monitor devices, detect threats, and support investigations.

Coming Soon

Mail Architecture

Email Basics

How mail clients, servers, DNS records, and protocols work together to send and receive email.

Data Protection

Encoding & Encryption

How information is represented for compatibility and protected for confidentiality.

Coming Soon

Web Requests

HTTP Methods

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

Coming Soon

Filesystem Metadata

Inodes

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

Regular Expressions

Regex

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

Security Monitoring

SIEM Basics

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

Packet Analysis

Tcpdump

How to capture and inspect network packets from the command line for troubleshooting and traffic analysis.

Text Editing

Vim

A keyboard-driven text editor designed for fast, precise editing in terminals and beyond.

Structured Data

XML

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

Built from curiosity

A Personal Library, Shared for Anyone Learning

Plain Library began as a casual side project and a way to keep my notes accessible from anywhere. It has grown into a public learning resource for people exploring cybersecurity and technology, especially beginners looking for clear explanations without having to piece everything together themselves. Each page stays concise so it can also serve as a quick reference for experienced readers.

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