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Comprehensive guide for contributing to WordPress core development, including environment setup, coding standards, hooks system, database API, REST API, testing, and Trac workflow.

Comprehensive guide for developing WebExtensions (browser extensions) for Mozilla Firefox, including Manifest V2/V3 configuration, all WebExtension APIs, security practices, web-ext CLI, and AMO submission.

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Comprehensive guide for developing MailExtensions for Mozilla Thunderbird, including Manifest V2/V3 configuration, all messenger.* APIs, UI actions, Experiment APIs, and ATN submission.

BPCore Engine - Lua game framework for Gameboy Advance with sprites, tilemaps, entities, collision, audio, multiplayer

Django Bolt - Rust-powered high-performance API framework, 60k+ RPS, decorator routing, built-in auth, async ORM

Build modern dynamic web applications with Django and htmx - partial rendering, HTMX-specific responses, and seamless frontend integration

Fast Django REST framework with Pydantic validation, type hints, and automatic OpenAPI documentation for building type-safe APIs

Visual regression testing using Playwright with toHaveScreenshot(), masking, thresholds, cross-browser testing, and VUDA integration for AI-powered visual analysis

Data validation using Python type hints with Pydantic models, settings, serialization, and performance optimization

PyQt/PySide6 overview hub - installation, comparison, project structure. See sub-skills for detailed topics.

PyQt/PySide6 QSS styling - selectors, properties, pseudo-states, dark theme, widget-specific styles

PyQt/PySide6 testing with pytest-qt - qtbot fixture, waitSignal, mouse/keyboard simulation, dialog testing

Python testing framework with powerful fixtures, parametrization, extensive plugin ecosystem, and support for async, Django, Flask testing

Python SQL toolkit and ORM with expressive query API, relationship mapping, async support, and Alembic migrations

Common Rust development pitfalls: frequent compiler errors, struct constructor patterns, test organization, and coverage enforcement for reliable codebases.