What is the technical guidelines of SEO?

Your website must include "robots.txt" file and submit your sitemap.xml file to Google. So Google will consider your website as active. 

Fast responsive website, well structured.

Technical guidelines

• To help Google fully understand your site's contents, allow all of your site's assets, such as CSS and JavaScript files, to be crawled. The Google indexing system renders webpages using the HTML of a page as well as its assets such as images, CSS, and Javascript files. To see the page assets that Googlebot cannot crawl and to debug directives in your robots.txt file, use the Fetch as Google and the robots.txt Tester tools in Search Console
• Allow search bots to crawl your sites without session IDs or arguments that track their path through the site. These techniques are useful for tracking individual user behavior, but the access pattern of bots is entirely different. Using these techniques may result in incomplete indexing of your site, as bots may not be able to eliminate URLs that look different but actually point to the same page.
• Make sure your web server supports the If-Modified-Since HTTP header. This feature allows your web server to tell Google whether your content has changed since we last crawled your site. Supporting this feature saves you bandwidth and overhead.
• Make use of the robots.txt file on your web server. This file tells crawlers which directories can or cannot be crawled. Make sure it's current for your site so that you don't accidentally block the Googlebot crawler. Visithttp://code.google.com/web/controlcrawlindex/docs/faq.html to learn how to instruct robots when they visit your site. You can test your robots.txt file to make sure you're using it correctly with the robots.txt analysis tool available in Google Search Console.
• Make reasonable efforts to ensure that advertisements do not affect search engine rankings. For example, Google's AdSense ads and DoubleClick links are blocked from being crawled by a robots.txt file.
• If your company buys a content management system, make sure that the system creates pages and links that search engines can crawl.
• Use robots.txt to prevent crawling of search results pages or other auto-generated pages that don't add much value for users coming from search engines.
• Test your site to make sure that it appears correctly in different browsers.
• Monitor your site's performance and optimize load times. Google's goal is to provide users with the most relevant results and a great user experience. Fast sites increase user satisfaction and improve the overall quality of the web (especially for those users with slow Internet connections), and we hope that as webmasters improve their sites, the overall speed of the web will improve.
• Google strongly recommends that all webmasters regularly monitor site performance using Page Speed, YSlow,WebPagetest, or other tools. For more information, tools, and resources, see Let's Make The Web Faster.

There are so many that people write entire books about them.

Some of the most basic are:

• Publish good, original content
• Don't put unnatural links on other websites
• Have good internal linking structure
• Be active on social media to give out favorable social signals