It is good practice for doctoral students to produce accessible theses because:
The accessibility guidelines exist to make sure that as many people as possible can access the information, for example, using screen readers.
There are many of styles and structures you can use to make your document accessible. The examples below are taken from the Government's guidance on producing accessible documents.
There are many guides available to help you create and check accessible Word and PowerPoint documents. Here are some examples, including the Microsoft advice, you can find alternatives online.
Webaim have a good guide on converting your Word files to accessible PDFs
Video guide Creating Accessible Word Documents
Video guide Creating Accessible PowerPoint Presentations
Once you have completed your documents make sure you use the Inspect Document accessibility checker in the Word and Powerpoint File menus:
Video content accessibility means including things like captions/subtitles, a transcript, and an audio description.
For other document types use the same principles and look for guidance online.