You can divide a post or page of your WordPress site into various dropdown sections. Section Page is a simple lightweight WordPress plugin that lets you to insert dropdown sections inside your pages and posts.
Install and activate Section Page. After activation visit your admin area Dashboard -> Settings -> Section Page and choose your options like you can select HTML heading tag and classes for sections, your can select a char before section title, a char when section is closed and a char when section is open.
How To Insert Sections ?
The plugin adds a dropdown section button in WordPress tinymce editor present in add new & edit post admin are pages. You can simply select your block of text and click the button to wrap the text into a section shortcode:
[section=Title of my section] Your content ... [endsection]
It will be get replaced by a dropdown section based on settings you have saved in its options page.