5 Tips for writing Good Test Cases

1. Start with understanding and identifying the requirements to identify the testable components. Create a Trace-ability Matrix for coverage.
2. Use Black Box Testing approach for your test case development. Write for all invalid and valid scenarios. 
3. The language should be simple. The test case should be written as it is guiding a user to use the system in small steps.
4. All the test cases should be dry run by testers before test execution
5. Keep updating the test cases!