You can order your long posts into subpages and your multipage posts will be having a table of contents linking single subpages with post titles.
Multipage Plugin allows you to manage long-long content pages and forget about the difficulty to find a post section. The plugin enables you to divide every blog post into multiple subpages, giving each page a title and place in table of content which appear at the top of your post (if enabled).
Table of contents simply helps you to redirect your visitors to the considered subpage of your main post.
To start using it in your WordPress site, simply install and activate Multipage Plugin then visit your admin area dashboard Settings -> Multipage screen.
Then you can use [nextpage title=”Pretty title”] shortcodes inside your your posts as shown in the given screenshot.