Many of us are familiar with PDF documents. But, I suspect, mostly shorter ones, one or a few pages. You can just scroll up and down to find what you want.
Trouble is, when the document has hundreds of pages, scrolling up and down doesn't help much!
If the document's author has taken the effort, you might find that there are tools to help navigation. In this example, a Table of Contents.
This first picture is a page of a document, and a menu on the left side showing various three options - the middle one opens up the Table of Contents (or Bookmarks).
Many PDF viewers have similar facilities but they are not always so easy to find or use – especially if you are using a mobile phone.
You have to fully download the document for the Table of Contents to be usable. Just viewing in a web browser is not sufficient.
Hopefully you can see > or ∨ symbols. If you click on > it should change to ∨ and open up the next layer of the list. This allows you to jump straight to an even smaller part of the document. If you click it again, it should close up.
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