What are the 3 essential elements for any web page?

Answer 1

Quick loading (no heavy graphics on home page, correct coding); frequent updates so when readers return they will have reason to return yet again and tell others to return; easy to read and attention grabbing

Answer 2

Presentation, Details (how does the site relate to your customers and how easy it is to navigate or use), Availability.

There are more but since you want three there you go