RAG has external knowledge read whereas fine-tuning comes with training data. Refer to this RAG v/s Fine-tuning guide to know the use cases and benefits of both.
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You just cannot guess and pick any model from the basket and train it. If the model is not compatible with your target task and framework, you won’t get the results.
Vectors databases make data management easy by storing vector embeddings using advanced storage, indexing, and query processing techniques. Learn their importance for LLMs through this article.
If your request volume escalates to millions per day then ChatGPT will be very costly over time. Fine tuning open source LLMs deployed to AWS is more affordable.