What are the essential points that should be covered in a dissertation abstract?
Any abstract should cover 4 elements: context, problem, solution, and validation, in this order. The main thing you want to highlight is the contributions of your dissertation. The context and problem descriptions are essential to try to make your contributions understandable, and to convince the reader that what you have done is important. Describing the validation is important so that you convince the reader that what you have done is correct/valid.