Fine-tuning requires you to train the model with a set of prompts and desired completions. Building a suitable dataset is not trivial and it's not clear what it

Fine-tuning requires you to train the model with a set of prompts and desired completions. Building a suitable dataset is not trivial and it's not clear what it would mean to use a book for fine-tuning anyway – masking sentences and paragraphs and training the model to complete them in the book's style?