Technical SEO

Robots.txt
XML sitemaps
404 errors
Fix broken pages
301 redirects
How to include/exclude items from XML sitemap?
Is Breadcrumbs good for SEO? Website should be secure (HTTPs)
Website loading time should be faster (test your website)
Make sure your site is mobile friendly (test your website)

Complete setup Yoast SEO plugin
Website should be crawlable
Check website indexability
Cannonical issues
What is schema markup?
Type of schema markup
How to add schema markup?Set up Google Search Console
Set up Bing Search Console
Set up Google Analytics