In this Midjourney AI tutorial for beginners, the speaker introduces Midjourney, an AI content generator that creates images from textual prompts in a Discord environment. Midjourney is a subscription-based bot with features like upscaling, saving images in PNG format, and generating images based on textual prompts. Users can write good prompts specifying the main subject, environment, background, and desired style. Midjourney offers various commands to adjust image size, direction, and style, as well as reverse prompting, optimizing prompts, and merging images.