With Quick Index you can easily add an index (Table of Contents) to your content. The index will be generated based on the headings in your content.Simply place {index} where you want the index to show.
You can see Quick Index in action on this website on all the Tutorial, FAQs and Videos pages (at the top of the content).
Quick Index offers a lot of options, allowing you to control what the index includes and how it looks.
How to use it: https://www.regularlabs.com/quickindex
Quick Index Pro v4.0.2