In theory, that's all you need. In reality, though…

"Can we make it scroll to section 1 slowly, so the user sees what's going on?"

"The heading of section 1 gets covered by the sticky top menu bar, change it so scrolling places section 1 just below the sticky."

Using HTML the way it was built to work isn't cool these days, didn't you get the memo?

I think they are talking about smooth scrolling.