What do I need to do in order to use the trended API?

API
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Hello everyone, I would like to bother all the experts. I am developing a project by developing a platform that uses AI Chat to answer specific questions, such as courses and majors of various faculties. The platform is a ready-made platform that only adds an API… The question is:

  1. I want to trend the AI ​​to understand specific data. What do I need to do in order to use the trended API?
  2. Do I need to use an AI Assistant or Fine-Tuning to get the API to use in the platform?
    Thank you all for sharing your knowledge.