Webhooks are tricky. They can be really useful for automatic responses to changes in a system, like updating the status on an item in Monday.com.
In this video I walk through setting up both the Test URL and Production URLs for a Webhook, and this also includes the path to handle the "challenge" data that Monday.com uses to verify the Webhook connection with n8n is valid. It's a small workflow example, but I've included that if it's a helpful reference.
Normally I would recommend using a Scheduling node instead because those doesn't have the chance of running too much, but a Webhook has the advantage of working for the specific trigger and not having to loop through extra items.
Let me know if you have questions about n8n Webhooks. Happy to dive deeper into the topic if there's interest!