Links in the top menu bar

My intention is to create a site on one page, but I don’t understand how can I create links in the top menu bar to go further down the page and to go to the differents widgets/sections of this page without scrolling???

It’s easy. You just need to add the ID of the section you want to target. You can do this by going to Appearance > Menus > and add Custom Links.

Now, your custom links will be in this form #pg-220-3(just an example).
This is how they are built:
The page ID can be found if you edit your page and check the URL bar in your browser and the row position starts from 0 to the number of rows you have.

thank you very much