Please can someone help me with the data journey associated with Post request?

Question

I'm stacked with this question for like a week now while taking the Typescript Full Stack Course with Angular NestJs.
I can't continue the lesson without solving the question correctly

Answer 1

This question seems unclear. Can you please be more specific? URLs can help...

Answer 2

Frontend send data
Backend received request
Post request send to the appropriate post route
Post route received data and encode it
Post route does something with received data
Post route send the response

Answer 3

Why do we only need to pass an id in a "delete" POST request?