It's pretty straightforward. Be creative and have fun!
Sources: 1. https://kindlepreneur.com/realistic-fiction-story-ideas/ 2. https://www.imagineforest.com/blog/mystery-writing-prompts/ 3. https://www.imagineforest.com/blog/mystery-writing-prompts/ 4. https://kindlepreneur.com/romance-writing-prompts/