I am working in an organization where they are following agile methodology.

the flow is as follows
Requirements -> features -> Test cases ->Defects->Regression->UAT->signoff

My doubt as a tester is I have to write test strategy followed by test scenarious then comes test cases ?

Please help me in a broader aspect, what is the test scenario ?

I am new to testing and i am often confused in writing test cases related to pick list , selecting different templates.

Do you guys have any examples of writing test cases from requirements ?

Is features Plays an important role while writing test cases please explain what does this features mean ?

thank you