DiscoTOC may also be useful for well structured posts like Read before posting.
It allows you to have a table of contents on the side like this
Installation
I’m not sure if this already comes installed on the official hosting (if it is just skip to step 5.) If not it’s pretty easy to install since it is a theme component and not a plugin. All you have to do is:
- go to the Admin Panel -> Customize ->Themes
- Click Install (bottom left corner)
- Then From a git repository and paste https://github.com/discourse/DiscoTOC.git
- Click Install
- Enable that theme component on the current theme
More detailed instructions here.
Usage
Then to add this table of contents to a post all that is needed it to click the 
icon when editing a post like so:
What do you think about this? In the instance I am am an admin for I find this quite useful.