From fundamentals to senior SDET, in order

The QA vocabulary every interviewer expects before automation questions start.

Only the Java that actually shows up in SDET interviews and framework code.

Browser automation from locators to Grid and safe parallel execution.

The execution engine: grouping, data driving, listeners and retries.

Readable specs that still map cleanly onto a Page Object framework.

REST Assured end to end: specs, POJOs, schema validation and chaining.

The level that decides your package: architecture, scalability, reusability.

Make the suite run without you: pipelines, schedules, reports, alerts.

Senior-level signals: architecture, flakiness strategy, distributed execution.