How is navigation inside the editor performed when working with an html document with a lot of text?

Question

HTML

I write documentation like
https://www.whonix.org/wiki/E-Mail#
https://access.redhat.com/documentation/en-us/red_...
https://linux.die.net/ HOWTO/Remote-Boot-4.html
in a regular HTML file. I use Notepad ++ for this, in which, unlike Word, you can’t create a title / bookmark on any selected text to make it easier to navigate through the document.
There is a lot of information, thousands of lines. It is difficult to navigate, navigate to sections and edit. The option to split the document and make sections into text files is not an option.
What are your thoughts/suggestions?

Answer 1

It's unclear. HTML has anchors that create a table of contents.

<a href="#Header01">Заголовок 01</a>

<!-- и где-то ниже в коде... -->

<div id="Header01">
  <h1>Заголовок 01</h1>
  <p>Многабукаф...</p>
</div>

Answer 2

Use something else.
Here webstorm has bookmarks Use bookmarks for navigation
or you can write TODO https://www.jetbrains.com/help/webstorm/using-todo.html with your own name, by which you can then filter