It is very natural to get nervous while creating a Landing Page. Thousands of people will land on that page. And depending on its design and how well-organized it is, they will either navigate further into your website or outright close the tab.
The basic purpose of the Sticky Header Menu for WordPress is to keep the Header visible at all times, no matter where your visitor is on the Web page.
Elementor Blocks are a combination of ready-made templates for the smallest and most fundamental parts of a Website, like a Header, Footer or CTA button etc.