Reading the acknowledgements in other dissertations in your field will give you an idea of the ways in which different kinds of help have been appreciated and mentioned.
The contents pages will show up the structure of the dissertation.
In addition to the research context, there may be other relevant contexts to present for example: It can be difficult to identify the best order for sections in this chapter because the rationale for your choice of specific research question can be complicated, and there may be several inter-linked reasons why the research is needed.
It is worth taking time to develop a logical structure as this will help to convince examiners of the relevance of your research, and that you understand its relevance.
The Abstract is an important element of the thesis, and will become a document in its own right if the thesis is registered within any database.
The examiners will therefore assess your Abstract both as part of your thesis, and as a potentially independent document.
It will also provide you with a framework to refer back to in your discussion chapter, when you reflect on the extent to which your research has achieved what it set out to do.
In these chapters a straightforward description is required of how you conducted the research.
It is certainly an academic exercise, but perhaps not too different from the concise explanations of your research you may have had to give to relatives and neighbours over the last few years, in terms of its brevity, accessibility, and comprehensiveness.
This is your opportunity to mention individuals who have been particularly helpful.