How to make the section slider work?

Question

Slider

Hello colleagues!) In general, I was inspired by the ideas to make a horizontal scroll on the site, and to scroll the entire screen. To do this, I want to use convenient navigation with hints and a slider at the bottom of the screen to move through the sections. Here's how I can not understand and make it all work.
Here is my link -> testingsite.tmweb.ru/nav_test/scroll.html
If anyone can help how to do this, I will be grateful.
But actually who I was inspired by www.espn.com/espn/feature/story/_/id/24504198/the-... , but there everything is intricately over the top and I'm sure everything can be done much easier.
Yes, I saw that the skrollr.js plugin is connected there, but is it connected with it. Is it possible to use another plugin, simpler?
Thank you.