Core answer
Start here. This is the direct spoken answer to practice first.
Why this question matters
E2E tests are expensive but valuable when they protect the path users and the business care about. The interview signal is choosing the right scope, not testing every pixel through the browser.
I would pick a critical flow such as login, create item, edit item, upload file, or checkout. The test sets up known data, drives the UI like a user, waits on visible outcomes instead of arbitrary sleeps, and asserts that the final state is correct. It uses stable selectors or accessible roles, not fragile CSS paths. The test cleans up its data or runs against an isolated test environment.