Por onde começar a desenvolver no Gemini
This is where you start: Get an API key | Gemini API | Google for Developers
Then there are quick starts and tutorials: Gemini API – Übersicht | Google for Developers
If already experienced in AI development, you will want to go to the language specific libraries and start writing some code.
For example, if you want to develop in Python, this is where you find information on that: Module: google.generativeai | Google AI for Developers | Google for Developers
Look for cookbooks that have short code examples you can reuse. Cookbooks are published as Jupyter notebooks.