Frankenstein describes in detail the process of creating the creature, starting with gathering body parts from graveyards and dissecting rooms. He then details the process of animating the body using electricity and the horror he felt upon witnessing the creature's birth.
However, Frankenstein does not explicitly reveal the secret of how to create a living being. He leaves Walton with a sense of wonder and fear, suggesting that the secret itself is too terrifying to fully comprehend.
The secrecy surrounding Frankenstein's creation is a key aspect of the novel's themes. It explores the dangers of unchecked ambition, the consequences of playing God, and the fear of the unknown.