Understanding why software testing matters and how to build confidence in your code. Learn the core principles that separate effective testing from test coverage theater.

Step-by-step guide showing how to add tests to legacy code without tests. Learn to identify what to test, write your first tests, and gradually improve coverage.

Step-by-step guide to writing unit tests that verify behavior, catch bugs early, and make refactoring safe. Learn the workflow, patterns, and best practices.

Comprehensive testing checklist covering unit tests, integration tests, test design, and quality gates. Use this reference to ensure your tests are effective and maintainable.

Master software product development fundamentals: user research, MVP validation, feature development, iteration, and metrics. Build products that solve real problems.

Learn frontend engineering fundamentals: build working interfaces, write maintainable code, optimize performance, and ensure accessibility.

Learn tmux step-by-step: installation, commands, sessions, panes, and workflows for productive terminal work.

Discover tmux, a terminal multiplexer that lets you manage multiple terminal sessions, detach and reattach to them, and keep your work running even when connections drop.

Learn core data engineering concepts, workflows, and applications. Understand how to transform raw data into reliable, accessible information.

Step-by-step guide to self-host n8n using Docker on Windows, Mac, or Linux with persistent data and webhook access.