A synopsis of what resources *are* would be helpful

Take, for example:

https://registry.terraform.io/providers/BetterStackHQ/better-uptime/latest/docs/resources/betteruptime_incoming_webhook

I visit this page, and I see a link.  But I think, "great?  What does this resource do?"

A short (1-2 paragraph) synopsis of why I would use this resource would be helpful.