Application QA and testing involve evaluating software to identify defects and ensure the application meets the functional and quality objectives. It is essential as it improves application performance, user experience, and overall customer satisfaction.

The testing process includes test planning, test case design, test execution, defect reporting, and test result analysis to ensure comprehensive evaluation of your application.

A test strategy outlines the high-level approach and objectives of the testing process, including the scope, resources, and tools to be used. On the other hand, a test plan provides a detailed roadmap for executing specific testing activities, including test cases, schedules, and responsibilities.

Manual testing is preferable for exploratory testing, early stages of the project, and product releases. Automated testing is ideal for repetitive and regression testing, large-scale projects, and situations when the application is stable (not active development).

Software testing involves different types (UI, security, performance, etc.) and different levels (unit, integration, etc.). Starting with a good strategy and plan will help you choose the right type and level of testing required for your application.