How to get started with outgoing Asana webhooks

I am struggling to figure out how to create outgoing webhooks from Asana. I’ve never created a webhook before and struggling to find basic information I need to start learning.

I have seen the documentation at Asana - this assumes more prior knowledge than I have, and searches here give results about specific problems.

For the immediate task, I need to set up an outgoing webhook that is triggered when a task is created/assigned to me. Is there a web interface I can use to set this up? If not, then what tools do I need in order to set it up? What documentation should I be reading? Is there a good primer on webhooks you can recommend?

Any help you can give me on starting my learning journey on webhooks would be most appreciated.