SEO Defination

Seo means  Search Engine Optimization,which is the process of getting traffic from the  “natural”,“organic,“editorial”,“free,” or search results on search engines.All major search engines such as Google,Yahoo ,Bing,Baidu,Ask.com,AOL.com and DuckDuckGo  have primary search resultsn and image,videos ,text,local listings are shown and ranked based on what the search engine considers most relevant to users.

 

1.Domain Authority

 You must be authorize your domain so search engine ranking score ranges from one to 100.Score can be used when tracking the "ranking strength" of a website over time or comparing websites.


2.Supports basic mobile-friendly viewport features
 

Your site being mobile-friendly should be a big part of your platform consideration seo.There are two major elements of being deemed mobile-friendly given below.
⦁    Specify your page a viewport matching the accessing device’s size.
⦁    Contents of pages fit within the viewport.

 

3.Allows (non-secure) JS and CSS to be indexed

you can see more details :click here.

 

4.Title Tag,Meta-Description,URL,Alt-Text on Images and Robots.txt Control
Title
 

<title>put your title here</title>
<meta name="title" content="put your title here.."/>

Tag,Meta-Description
<meta name="description" content="put your description less then 200 words"/>

URL
www.example.com

Alt-Text on Images
<img class="img-responsive" src="image-path" alt="image description">

Robots.txt Control
User-agent: *
Disallow:
or
User-agent: *
Allow: /

 

<meta name="robots" content="noindex, nofollow">

 

5.Your site must be supports a custom 404 page.
 

A custom page 404 only helps satisfy that guideline  or it me be help "save" traffic from abandoning your website when the encouter a broken link.
 

6.Omit inline css
 

you should be omit inline css.You can put your css code on your style.css and call class of id in html view.
 

7. Caters to more than one location or language

If your website to target in multiple markets or multiple country,your website platform should include the following features which are given below. 
⦁    Rendered in plain HTML with country/language selector
⦁    Country/language selector overrides any automated geolocation.
⦁    Either the page level or within XML sitemaps provides automated hreflang tagging.

 

8.Content headers able to be customized on a per-page basis

Same  as title tags, given above…
 

9.Automated XML Sitemap production

<?xml version="1.0" encoding="UTF-8"?>
<urlset
      xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
            http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"> 
  <url>
    <loc>http://your-domain-name-or-link-here.com/</loc>
  </url>
  
</urlset>

 

10. Some seo related  topic

⦁     Provide clear text,image,video, deep, engaging, and easy-to-find content on your site.
⦁    Keep page titles clear and relevant.
⦁    Sharing with social media so positive signals and can have an impact on how you rank organically in the long run.
⦁    Important yor page speed, along with a positive,useful user experience.
⦁    You shuld alt attributes to describe images,so that search engine can better understand the content like bing,google,yahoo etc.
⦁    Your website must be unique, valuable, or engaging.
⦁    Server response time <500ms (<200ms, ideally).
⦁    Supports browser caching
⦁    Supports your  JS and CSS minification .
⦁    Supports inclusion of social sharing buttons on product pages.
⦁    Supports Open Graph tags on all pages 
⦁    Supports Organization, Product, Local Business and Breadcrumb schema markup on appropriate pages.
⦁    Supports breadcrumbs on e-commerce category, subcategory and product pages.

 

        Things to avoid:

⦁    Thin content, pages showing mostly ads or affiliate links, or that otherwise redirect visitors away to other sites will not rank well.
⦁    Abusive link tactics that aim to inflate the number and nature of inbound links such as buying links, participating in link schemes, can lead to de-indexing.
⦁    Ensure clean, concise, keyword-inclusive URL structures are in place. Dynamic parameters can dirty up your URLs and cause duplicate content issues.
⦁    Make your URLs descriptive, short, keyword rich when possible, and avoid non-letter characters.
⦁    Burying links in Javascript/Flash/Silverlight; keep content out of these as well.
⦁    Duplicate content
⦁    Keyword stuffing
⦁    Cloaking — the practice of showing search engine crawlers different content than visitors.