A beautifully designed, visually engaging infographic cheatsheet for ChatGPT, styled as a vintage travel poster. The layout should be clean and intuitive, using a pastel color palette of blues, greens, and yellows. Imagine a charming train station scene in the background, subtly hinting at a journey of AI discovery. The cheatsheet should present key ChatGPT commands and tips in a concise, memorable way, employing elegant typography and playful illustrations. Aim for a highly detailed, 4k resolution image, with a focus on clarity and aesthetic appeal. Golden hour lighting bathes the poster, evoking a sense of nostalgia and wonder.