I am looking for resources to learn how to build my own apps for Monday. I need to build a few things that i can’t find in the app marketplace.
Hello there @JCouto,
Here you have some useful links for that:
API documentation: monday.com GraphQL API
Apps framework documentation: What is a monday app?
Workflow blocks webinar: Workflow Blocks webinar | monday.com - YouTube
Postman examples: Postman
These links should give you what you need to get started 
Cheers,
Matias