Google Search

Title - The title of the site.

URL - The URL of the result.
Snippet - A description of the page description meta tag

Featured Snippet

Appearance analysis

See search appearance data

Library

google_search_features.js - Gut check your page to make sure it renders correctly for Google Search.
lazyimages_without_scroll_events.js - Determine if your lazy loaded images will be seen correctly by Google Search.

API

Your own web site: Google Search

Reference
Online Front end with an access token
Example:
- Query Search analytics

Other website: Google Custom Search

Cost: 5 per 1000

Web vitals

For CLS issue: more than 0.1 (desktop) see https://web.dev/cls/

Documentation / Reference

Google Doc on SEO