Functionality checks across every key element and scenario.
User-flow testing (registration, forms, navigation, etc.).
Design parity check against Figma and reporting deviations.
Responsive design checks (mobile / tablet / desktop).
Cross-browser testing (Chrome, Safari, Firefox, and others).
Cross-platform testing (Windows, macOS, iOS, Android).
Testing on real devices.
Bug, UI-error, and unstable-behavior hunting.
Ad-hoc testing (looking for non-standard and hidden issues).
Usability and UX checks.
Test checklist and bug report with priority levels.
UX/UI improvement recommendations where relevant.