I think combining e-book writing with teacher training can be very effective because it allows educators to turn their classroom experience into structured learning resources. Teachers already understand common student difficulties, so they are often in a strong position to create material that is practical, focused, and easier to apply.
The quality of the content still depends heavily on planning, research, organization, and revision. Educators who want to strengthen those areas can also look at academic writing support for guidance related to research, structure, editing, and presenting ideas more clearly.
Teacher trainers can add another useful layer by helping educators think about learning objectives, instructional design, assessment, and accessibility. When subject knowledge and good content development come together, e-books can become much more than digital textbooks—they can serve as flexible teaching tools for both students and instructors.