You can find the guide here https://stability.ai/learning-hub/stable-diffusion-3-5-prompt-guide
The first paragraph says "Prompting is a valuable technique for effectively using generative AI image models. The structure of a prompt directly affects the generated images' quality, creativity, and accuracy. Stable Diffusion 3.5 excels in customizability, efficient performance, diverse outputs, and versatile styles, making it ideal for beginners and experts alike. This guide offers practical prompting tips for SD3.5, allowing you to refine image concepts quickly and precisely."