A post-create task is a task that runs after a blueprint or runbook deployment is completed. A post-create task can be used to perform additional configuration or automation on the deployed resources. An HTTP task is a task that executes an HTTP request to a specified URL, with optional headers, body, and authentication. An HTTP task can be used to trigger an API call to another system or service, such as creating a front end application. A predefined task is a task that uses a predefined script or command to perform a common operation, such as installing a package or running a service. A predefined task cannot be used to trigger an API call to another system or service. An eScript task is a task that executes a custom script written in JavaScript or Python. An eScript task can be used to perform complex logic or operations that are not available in predefined tasks. However, an eScript task requires more coding skills and testing than an HTTP task. A simple task is a task that executes a simple command or script on the target VM or host. A simple task cannot be used to trigger an API call to another system or service. References:
https://www.nutanix.com/content/dam/nutanix/resources/support/ebg-ncp-mca-6.pdf
https://www.nutanix.com/support-services/training-certification/certifications/certification-details-nutanix-certifi