Python
Backstage Tutorial Developer Portal by Spotify 2026
Build an internal developer portal with Backstage — software catalog, templates, plugins, and TechDocs.
tutorials
Python
Python
Visual Regression Testing Percy & Chromatic Tutorial
Catch UI bugs automatically — screenshot comparison with Percy, Chromatic, and Playwright visual testing.
Python
Contract Testing with Pact Microservices Testing Guide
Prevent integration failures — consumer-driven contracts with Pact, provider verification, and CI integration.
Python
k6 Load Testing Tutorial Performance Testing for APIs
Stress-test APIs with k6 — virtual users, scenarios, thresholds, checks, and Grafana integration.
Python
Vitest Tutorial Fast Unit Testing for Vite Projects 2026
Test Vite projects with Vitest — zero-config, ESM support, snapshot testing, mocking, and code coverage.
Python
Cypress Component Testing Unit Test React Vue Components
Test framework components in isolation with Cypress — mount, intercept, assertions, and visual testing.
Python
Playwright Tutorial End to End Testing with Auto Wait 2026
Test web apps with Playwright — auto-wait, selectors, assertions, fixtures, trace viewer, and CI integration.
Python
SQL JSON Functions Query JSON Data in PostgreSQL & MySQL
Work with JSON in SQL databases — jsonb operators, JSON_EXTRACT, indexing JSON, and when to use JSON columns.
Python
SQL Pivot Tables & Crosstab Queries Tutorial
Transform rows into columns with SQL — CASE WHEN pivot, PostgreSQL crosstab(), MySQL pivot techniques.
Python
SQL Stored Procedures & Functions MySQL & PostgreSQL
Encapsulate business logic in the database — stored procedures, user-defined functions, triggers, and cursors.
Python
SQL Query Optimization EXPLAIN Indexes & Execution Plans
Speed up slow queries — EXPLAIN ANALYZE, index strategies, covering indexes, query rewrites, and statistics.
Python
SQL Common Table Expressions CTEs Recursive & Non Recursive
Simplify complex queries with CTEs — WITH clause, recursive CTEs for hierarchies, and materialized CTEs.
Python
SQL Window Functions ROW NUMBER RANK LEAD & LAG
Master SQL window functions — ROW_NUMBER, RANK, DENSE_RANK, LEAD, LAG, SUM OVER, and running aggregates.
Python
HTML Drag and Drop API Interactive UIs Tutorial
Build drag-and-drop interfaces — draggable, dropzone events, sortable lists, and file drop zones.
Python
HTML Canvas API Drawing Animation & Mini Games
Draw on the web with Canvas API — 2D context, shapes, images, animation loops, and building a mini-game.
Python
HTML Dialog Element & Popover API Modern Modals 2026
Replace modal libraries with native HTML — <dialog>, showModal(), Popover API, and accessibility patterns.
Python
HTML Forms Advanced Validation FormData & File Uploads
Build production forms — constraint validation, FormData API, file uploads, progress bars, and custom validity.
Python
HTML Semantic Elements Complete Guide for SEO & Accessibility
Write meaningful HTML — article, section, nav, aside, header, footer, main, figure — and why search engines reward it.
Python
CSS Nesting has() & Modern Selectors Guide 2026
Write cleaner CSS with native nesting, :has() parent selector, :is(), :where(), and new color functions.
Python
styled components & Emotion CSS in JS for React
Style React apps with CSS-in-JS — styled-components, Emotion, dynamic props, theming, and SSR support.
Python
CSS Scroll Driven Animations New Browser API Guide
Create scroll-linked effects with native CSS — animation-timeline, view(), scroll(), and intersection triggers.
Python
CSS Subgrid & Advanced Grid Techniques 2026
Go deeper with CSS Grid — subgrid, named grid areas, auto-fit/auto-fill, masonry layout, and complex layouts.
Python
CSS Custom Properties Variables Dynamic Theming Guide
Use CSS custom properties for theming — :root variables, JavaScript integration, dark mode, and scoped theming.
Python
CSS Animations & Transitions Complete Guide with Examples
Master CSS animations — @keyframes, transition timing functions, animation events, performance, and GPU acceleration.
Python
CSS Container Queries Responsive Components Guide 2026
Build truly responsive components with CSS Container Queries — @container, container-type, size queries, and style queries.