If I share my experience, a professional photography course mainly teaches these key things:
First, they teach you the basics of the camera, especially the exposure triangle (aperture, shutter speed, ISO), which is the foundation of photography. Then, you learn composition and framing, like the rule of thirds and leading lines, which help make your photos look more professional,They also focus a lot on lighting—how to use natural light and basic artificial light properly.
Another important part is photo editing, where you learn to use tools like Adobe Lightroom and Photoshop to enhance your images. Finally, you develop your own creative style and learn how to tell a story through your photos.
Overall, from my experience, the course teaches both technical skills and creativity, which really helps you grow as a photographer.