In this video, I’ll show you how to Create and Add Video Chapters to your YouTube Videos.
Having Video Chapters for your YouTube videos makes it easier for your audience to watch and navigate through your content.
Video chapters are automatically generated from the transcripts added in the video description.
According to YouTube, the first timestamp should start at 00:00, be of a minimum length of 10 seconds and you should have at least 3 timestamps listed in ascending order.
I hope this helps.