What SEO professionals should follow to get top ranking in Google 2019?

These are the key points/factors for Google SEO 2019.

• Working closely with the developers to follow the best practices of Web Development.
• Mobile First Indexing.
• Applying Structured Data.
• Modern Javascript based websites.
• Canonicalisation is Must.
• Not creating backlinks/post that will expire soon. That will decrease your website value or ranking.
• Analyse and Improve Page speed of all pages in the website, not the home URL alone. Do Lighthouse Test & try www.webpagetest.org
• Implementation of AMP (Accelerated Mobile Pages).