Cypress Automation

Hi I need help to build cypress automation framework for a UI.
Please reply with answers for below questions for faster acceptance.
Questions:
What is Callback & Promise in Javascript and tell me a usecase for them
How to select a dropdown in cypress
How to handle iframes in cypress
How to handle windows in cypress
Write a code snippet in javascript to print 0, 1, 1, 2, 3, 5, 8, 13, 21
write a code snippet in javascript to remove first & last element from [1,2,3,4,5]
what are the challenges in cypress & how to handle them
Difference between put, post & patch
How will you debug client errors in API? like say 406 or 409
write code snipped to handle making an API request in Cypress?
How can you set up and use fixtures in Cypress for testing?
what kind of assertions will you use in cypress. Write a code snippet for that
How do you parameterize API tests in Cypress?
what is serialization & deserialization
what are the various authentication types in api & How can you handle API authentication in Cypress tests?
How to call cypress tests from Jenkins