I have just installed a theme extension which allows first post on any topic to have a Table of Contents
It is an index which contains all important points of a long text
We use them, for example, in our documentation (the column at the right):
Just click on the icon when composing a topic, and select Insert a table of contents:
Everything will be automatically added!
You can find a preview on this topic, but if you want a more detailed one check the following topic: Kodular Draco 🐉
It works on both desktop and mobile: