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Plugins: Table of Contents Plus
What it is: A powerful yet user friendly plugin that automatically creates a context specific index or table of contents (TOC) for long pages (and custom post types). More than just a table of contents plugin, this plugin can also output a sitemap listing pages and/or categories across your entire site.
Built from the ground up and with Wikipedia in mind, the table of contents by default appears before the first heading on a page. This allows the author to insert lead-in content that may summarise or introduce the rest of the page. It also uses a unique numbering scheme that doesn’t get lost through CSS differences across themes.
This plugin is a great companion for content rich sites such as content management system oriented configurations. That said, bloggers also have the same benefits when writing long structured articles. Discover how Google uses this index to provide ‘Jump To’ links to your content.
More info: https://wordpress.org/plugins/table-of-contents-plus/