What is the minimum cost to publish a book?

Good day, I am curious about the cost associated with publishing a book. Specifically, I'm wondering about the minimum amount one would need to budget for this endeavor. Is there a standard or a typical range of costs that I should be aware of? Furthermore, do these costs vary significantly depending on factors such as the size of the book, the level of editing and design involved, or the platform used for publishing? It would be greatly appreciated if you could provide some insights into this matter.