If you press NVDA + F7, NVDA will show a popup with a list of all the links, headings, form fields, buttons, and landmarks of the page.
If you are unfamiliar with landmarks, these are the larger sections of a page, offering screen reader users a coarser but quicker way of navigating a page than jumping through all the links, headings, etc.
Try it out, you should be able to see a few landmarks on this page.
You can navigate the Elements List dialog using TAB, SHIFT + TAB, the arrow keys ↓ ↑ → ←, and ENTER.