Updated on Mar 13, 2019
HTML is W3C validated - The cleaner your source code is the easier search engines can crawl and index your pages. W3C validity is in direct relation with your source code structure.
No flash found - Flash was mainly used a few years back and is no longer a viable format for websites. Search engines and browsers have hard time understanding and visualizing flash pages.
Remove inline CSS - CSS should be kept as a separate file and not show as part of the source code of a web page as it will make it more difficult for crawlers to index your page.
Text to HTML ratio is too low (<25%) - You need to have more than 25% of your web pages as text content in order for search engines to understand them. If you have more than 75% of your web page as HTML that will not be possible.
Found schema markup - As search engines have hard time understanding data without some sort of explanation what exactly that data means, schema was invented. Schema microdata is extra code in the form of types and attributes that can be added directly to the HTML of a page and is used to explain to search engines abstract definitions like time and other specific parts of page structure and content that could result in irrelevant search results. For more information on how to add Schema to your website pages you can check the official Schema documentation.
Link to a sitemap.xml - Having a sitemap.xml will help search engines in finding all of your content which will certainly affect your SEO and domain authority.
Server Compression - This point coves the compression of data coming out of the server you are hosted on. Compression of any kind and especially Gzip will positively affect your website speed and also SEO. For more information on Gzip you can check out our "Enable Gzip Compression" tutorial on the matter.
Found heading tags: H1, H2 and H3 - By using heading tags you help search engines understand your content better.
Exact Keyword found in H1, H2 and H3 tag - Implementing the target keyword in your H1, H2 and H3 tags will increase the SEO rate of your website.
There are no duplicate heading tags - Repeated h1, h2 and h3 tags can confuse search engines, so you must avoid them.