I would like to know what would be the best and one of the most effective technical SEO for 2021. I want to focus in On-Page SEO particularly in technical aspect of optimization.

-Update your page experience – core metrics
-Crawl your site and look for any crawl errors
-Fix broken internal and outbound links
-Get rid of any duplicate or thin content
-Migrate your site to HTTPS protocol
-Make sure your URLs have a clean structure
-Ensure your site has an optimized XML sitemap

-Get rid of any duplicate or thin content
-Migrate your site to HTTPS protocol
-Make sure your URLs have a clean structure
-Ensure your site has an optimized XML sitemap

Technical SEO Checklist

-Make Sure You Are Using HTTPS
-Check For Duplicate Versions Of Your Site In Google's Index
-Find and Fix Crawl Errors
-Improve Your Site Speed
-Fix Broken Internal and Outbound Links
-Find and Fix HTTP Links on HTTPS Pages
-Make Sure That Your Website is Mobile-Friendly

-Find and Fix Crawl Errors
-Improve Your Site Speed
-Fix Broken Internal and Outbound Links
-Make Sure That Your Website is Mobile-Friendly

Hey @sophia, thanks for sharing a great post!!

Write for humans first and search engines second. ...
Use targeted keywords in all the right places. ...
Focus on user experience (UX) ...
Focus on building relevant links. ...
Format content for Featured Snippets. ...
Remove anything that slows down your site. ...
Pay attention to Google algorithm updates.

one in all the biggest announcements about search engine optimization changes to pop out of Google this year, the web page enjoy replace essentially confirms consumer experience will become an seo ranking sign in some unspecified time in the future in 2021. The better the consumer revel in of the web page, the more likely it gets weight from the search set of rules.