Using custom APIs

Questions
1

I am a bit new and I want to understand

  1. If or not we can build custom APIs here, like for eg, retrieving data from a WordPress-based website or auto-posting on Instagram, etc.
  2. Does n8n have its own APIs, like a developer module to use data generated here at an external place?
  3. If yes, how or from where?
    PS: I have the free version installed, also a quick response would be very much appreciated as it is required for covid related platforms
2

Welcome to the community @Kishoraditya

  1. If or not we can build custom APIs here, like for eg, retrieving data from a WordPress-based website or auto-posting on Instagram, etc.

Yes, you can build a custom node or you can use the HTTP node. The HTTP works with any custom API.

  1. Does n8n have its own APIs, like a developer module to use data generated here at an external place?

n8n does not have an API, but you can still send data to n8n using the Webhook node.

Below you can find resources to get started with both.