Fixed anchored Scroll

Hi guys!
I’m new here, I’m building my portfolio and I was looking for a way to make a website to scroll like this one: Anti Agency Group

Here is another example, a little bit complex but can give you an idea: Active Theory | Works

So in practice, I want my scroll fixed at a certain point to make every section I want to show 100VH and have a sort of “PowerPoint-style” scrolling experience.

Do you have any advice? Do I need a custom code or is there a way to do it?