Start from any URL
Open a detail page directly, refresh the browser, and try a nonexistent URL. Navigation should work without requiring a visit to the homepage first.
Check content and devices
Try long titles, differently proportioned images, and narrow screens. Check keyboard navigation, focus states, and enlarged text.
Make sure requests are actually received
Only show success after the server confirms that data was saved. Test disconnections, duplicates, and invalid input so users do not lose information.