How to do menu scrolling track list

I want to create a list like below but i dont know exactly what name is it .

My menu
1. Top
2. Content 1
3. Content 2
4. Bottom

When i click 1,2,3,4 it will scroll to the match content.
And when i scroll page its will show the match . example when i read content2 the menu will make "Content 2" to bold text


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