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Quality & Performance - React & Next.js Frontend Foundations | Aporeon

React & Next.js Frontend Foundations

Quality & Performance

Accessibility, frontend performance, component testing, error boundaries, and production recovery.

6 drillsPractice one at a timeOrdered pathDebugging scenarioArchitecture scenarioConcept question

Recommended start

Web Vitals Diagnosis

Uses field data, lab evidence, and release correlation to diagnose LCP, INP, and CLS regressions without guessing.

Hard~12 minStep 1 of 6

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1Web Vitals DiagnosisRecommended startUses field data, lab evidence, and release correlation to diagnose LCP, INP, and CLS regressions without guessing.Debugging scenarioHard~12 minNext.jsReactTypeScriptPractice

Practice order

6 drillsOne at a time

1Web Vitals DiagnosisUp next / Hard / ~12 min
2Frontend Test StrategyMedium / ~10 min
3Accessibility BasicsMedium / ~7 min

2

Frontend Test StrategyBuilds a risk-based frontend test strategy across unit, component, integration, contract, and end-to-end boundaries.Architecture scenarioMedium~10 minNext.jsPlaywrightReact

Practice

3Accessibility BasicsExplains labels, keyboard behavior, focus, semantic HTML, errors, color contrast, and accessible custom controls.Concept questionMedium~7 minReactTypeScriptPractice

4Frontend PerformanceExplains practical frontend performance work: measuring, render cost, memoization, bundle splitting, images, and hydration.Concept questionHard~9 minNext.jsReactTypeScriptPractice

5Component TestingExplains component tests that assert user-visible behavior instead of implementation details.Concept questionMedium~7 minNext.jsPlaywrightReactPractice

6Error BoundariesExplains how React error boundaries, route errors, safe fallbacks, logging, and recovery work together.Concept questionMedium~7 minNext.jsReactTypeScriptPractice

4Frontend Performance

Hard / ~9 min

5Component TestingMedium / ~7 min

6Error BoundariesMedium / ~7 min