Hi @jmovish
It looks like a clever version of a navbar linking to sections. That dot isn’t moving as such, just a new link is being highlighted as you scroll to that section in the page, and similarly when you click on a dot it takes you to the corresponding section.
The simplest way to get your head round it is imagine for a moment those dots as a standard nav menu list with text links; you might change the colour of text, or the button shape that surrounds them, when you are on the ‘current’ section it links to.
The dot shapes have been made by using a link block with a border of 2px with a radius of 30px, the link block doesn’t need to contain text so is simply a box made circular. When the link is the ‘current’ one it is set to a background of white, and when not current, is set to transparent.
Hope that helps!
Stu