Step 1. Verify that your page or site is missing
It sounds obvious, but first verify that your page or site is actually missing from Google's index. Many people assume that
they are not on Google, when in fact their page simply appears very low in Search results.

Did you recently create the page or request indexing? It can take time for Google to index your page; allow at least a week
after
submitting a sitemap or a submit to index request before assuming a problem. If your page or site change is recent,
check back in a week to see if it is still missing.

To verify your presence on Google:

Turn off safe search, which might be filtering your results.

Search Google for your site or page:

For a missing site: Do a site search with the syntax
site:your_domain_name Example: site:example.com

For a missing page:
Do an info search for your page URL in Google, without the http or https, or anything after the ? or #

in the URL. Example: info:google.com/about

If you see results, then the site or page is in the index:

For a site: It is possible that not every page on the site is indexed, but the site itself is in our index. Consider adding a
sitemap to help Google discover all the pages in your site.

For a page: If a page is in the index, but not performing as well as you think it should, check our webmaster guidelines for
tips on improving your search performance. If the page has suffered a recent ranking drop, you can try to troubleshoot

that.
If you have multiple versions of a page (for example a mobile and a desktop version, or two URLs that point to the
same page), Google will consider one to be canonical and all others to be duplicates, and Search results will point only to
the canonical page.

Use the
Index coverage report to look for excluded pages and try to find your URL.
If you still can't find your site or page in Search results, keep reading.

Step 2. Fix the problem
These instructions assume that you have a Search Console account because it is much easier to diagnose indexing
problems using Search Console.

Did you recently buy or inherit this site from someone else? It's possible that you got a site with existing manual actions
filed against it. The history pages in the Manual Actions report and Security Issues report will show any outstanding
actions filed against it. Read the documentation for your report to learn how to resolve pre-existing issues in a purchased
site.

How Google Crawls The Web Crawling

The first step is finding out what pages exist on the web. There isn't a central registry of all web pages, so Google must
constantly search for new pages and add them to its list of known pages. This process of discovery is called crawling.

Some pages are known because Google has already crawled them before. Other pages are discovered when Google
follows a link from a known page to a new page. Still other pages are discovered when a website owner submits a list of
pages (a sitemap) for Google to crawl.

If you're using a managed web host, such as Wix or Blogger, they might tell Google to crawl any updated or new pages
that you make.

To improve your site crawling:

For changes to a single page, you can submit an individual URL to Google.

Get your page linked to by another page that Google already knows about. However, be warned that links in

advertisements, links that you pay for in other sites, links in comments, or other links that don't follow the Google
Webmaster Guidelines won't be followed.
Indexing
After a page is discovered, Google tries to understand what the page is about. This process is called indexing. Google
analyzes the content of the page, catalogs images and video files embedded on the page, and otherwise tries to
understand the page. This information is stored in the Google index, a huge database stored in many, many (many!)
computers.

To improve your page indexing:

Create short, meaningful page titles.

Use page headings that convey the subject of the page.

Use text rather than images to convey content. (Google can understand some image and video, but not as well as it can
understand text. At minimum, annotate your video and images with alt text and other attributes as
Serving (and Ranking)

When a user types a query, Google tries to find the most relevant answer from its index based on many factors. Google
tries to determine the highest quality answers, and factor in other considerations that will provide the best user
experience and most appropriate answer, by considering things such as the user's location, language, and device
(desktop or phone).

For example, searching for "bicycle repair shops" would show different answers to a user in Paris than it would to a
user in Hong Kong. Google doesn't accept payment to rank pages higher, and ranking is done programmatically.

To improve your serving and ranking:

***
Make your page fast to load, and mobile-friendly.

Put useful content on your page and keep it up to date.

Follow the
Google Webmaster Guidelines, which help ensure a good user experience.

Read more tips and best practices in our
SEO starter guide.
You can find more information here, including the guidelines that we provide to our quality raters to ensure that we're
providing good results

The Long Version   Want more information? Here it is:  https://support.google.com/webmasters/answer/70897

What is a sitemap?

A sitemap is a file where you provide information about the pages, videos, and other files on your site, and the  
relationships between them. Search engines like Google read this file to more intelligently crawl your site.

***A sitemap tells the crawler which files you think are important in your site, and also provides valuable information
                   about these files: for example:
                   for pages,  when the page was last updated,
                   how often the page is changed,
                   and any alternate language versions of a page.

You can use a sitemap to provide information about specific types of content on your pages, including video and image
content. For example:

A
sitemap video entry can specify the video running time, category, and age appropriateness rating.

A sitemap image entry can include the image subject matter, type, and license.
         Google