The data annotation course offers a comprehensive exploration of fundamental principles and practices in data annotation, spanning text, images, audio, and video formats. It introduces widely used annotation tools like CVAT and V7 Lab, emphasizing tasks such as image classification, object detection, and segmentation. The course underscores the significance of clear guidelines and a standardized workflow, covering creation, annotation, review, and quality control. Participants will gain insights into best practices, challenges, and emerging trends in data annotation, providing a foundation for effective and precise annotation work that contributes to the advancement of AI systems.