How do I create a Page or Post Jump like this website

I want to know how to do a list article where there’d be a subtitle with a clickable link that will follow to it.

Once I click on it, it will jump to the equivalent title.

Like Joost did in that article. When you click on anything, it will jump down to the topic.

I want to know the basics of setting this up without hassle.

I can’t upload the snapshot but that link would help.

The page I need help with: [log in to see the link]