Best practices for making a GUI engaging for e-learning include:

1. Clear and concise language

2. Intuitive navigation and information architecture

3. Visually appealing design and graphics

4. Interactive elements, such as gamification, simulations, and quizzes

5. Multimedia content, like videos, animations, and audio

6. Personalization and adaptability to individual learners

7. Real-time feedback and assessment tools

8. Social learning features, like discussion forums and collaboration tools

9. Mobile-friendliness and accessibility

10. Consistency and coherence throughout the GUI

11. Use of storytelling and scenario-based learning

12. Opportunities for exploration and discovery

13. Clear goals, objectives, and progress tracking

14. Support for different learning styles and abilities

15. Continuous testing and iteration to improve engagement

Additionally, consider the following:

- Use a conversational tone and humanize the interface

- Make it fun and enjoyable!

- Use rewards and incentives to motivate learners

- Provide opportunities for reflection and self-assessment

- Incorporate real-world examples and applications

- Use humor and emotional connections to engage learners

By incorporating these best practices, you can create an engaging and effective GUI for e-learning that supports learner motivation, interaction, and achievement.