Table of Contents Plus

Weird: the excerpts are replaced by the TOC of the posts – and there’s nothing you can do about it. It appears this plugin is not tested out carefully.

This is the best-working plugin for automatically displaying the table of contents of articles. So far, no problems have occurred.
I would like to express my sincere gratitude to the author!

This plugin currently has a security vulnerability. Patchstack informs about it. Since no more updates are likely to follow, as reported in another comment, please proceed with caution.

Thank you Mike,

I have tried almost 10 plugins, and in my opinion, this is the best among them.
If the following two options are added to the position section, it can be used everywhere:
1- Before the first paragraph
2- After the first paragraph

It worked right out of the box! It didn’t slow down the page loading time at all. I’m using LiteSpeed Cache plugin and that might count, but still, this is exactly what I was looking for.