GUIDES

Learn modern DevOps.

Practical explanations built around infrastructure work, not textbook filler.

NETWORKING

Networking

Addressing, DNS and connectivity concepts used across infrastructure.

Prefixes, subnet masks, address ranges, sizing and practical infrastructure examples.

A layered workflow for interfaces, routes, DNS, ports and application connectivity—with selective macOS alternatives.

LINUX

Command interpretation and operational references for day-to-day Linux work.

Start with a simple worker-and-queue mental model, then learn what the 1, 5 and 15 minute values really mean.

Read every major top field, interpret CPU and memory signals, and prepare for common Linux interview questions.

Save stdout and stderr to date/time filenames with tee and shell redirection.

DOCKER

Fix interactive timezone prompts and understand when docker build needs a build argument.

GIT

Separate SSH authentication and Git commit identity cleanly.