A 'walkthrough' is an informal meeting for evaluation or informational purposes. Little or no preparation is usually required.

Q - What makes a good test engineer? A
good test engineer has a 'test to break' attitude, an ability to take
the point of view of the customer, a strong desire for quality, and an
attention to detail. Tact and diplomacy are useful in maintaining a
cooperative relationship with developers, and an ability to communicate
with both technical (developers) and non-technical (customers,
management) people is useful. Previous software development experience
can be helpful as it provides a deeper understanding of the software
development process, gives the tester an appreciation for the
developers' point of view, and reduce the learning curve in automated
test tool programming. Judgment skills are needed to assess high-risk
areas of an application on which to focus testing efforts when time is
limited.

Q - What makes a good Software QA engineer?

The same qualities a good tester has are useful for a QA engineer.
Additionally, they must be able to understand the entire software
development process and how it can fit into the business approach and
goals of the organization. Communication skills and the ability to
understand various sides of issues are important. In organizations in
the early stages of implementing QA processes, patience and diplomacy
are especially needed. An ability to find problems as well as to see
'what's missing' is important for inspections and reviews.
Q - What is agile testing?
Agile testing is used whenever customer requirements are changing dynamically
If we have no SRS, BRS but we have test cases does you execute the test cases blindly or do you follow any other process.
Test case would have detail steps of what the application is supposed to do.
1) Functionality of application.
2) In addition you can refer to Backend, is mean look into the Database. To gain more knowledge of the application.