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Meta descriptions contains between 70 and 160 characters (spaces included).
It allow you to influence how your web pages are described and displayed in search results.
Ensure that all of your web pages have a unique meta description that is explicit and contains your most important keywords (these appear in bold when they match part or all of the user's search query).
A good meta description acts as an organic advertisement, so use enticing messaging with a clear call to action to maximize click-through rate.

Code to text ratio represents the percentage of actual text on a web page compared to the percentage of HTML code, and it is used by search engines to calculate the relevancy of a web page.
A higher code to text ratio will increase your chances of getting a better rank in search engine results.

Gzip is a method of compressing files (making them smaller) for faster network transfers.
It allows to reduce the size of web pages and any other typical web files to about 30% or less of its original size before it transfer.

Redirecting requests from a non-preferred domain is important because search engines consider URLs with and without "www" as two different websites.

A sitemap lists URLs that are available for crawling and can include additional information like your site's latest updates, frequency of changes and importance of the URLs. This allows search engines to crawl the site more intelligently.
We recommend that you generate an XML sitemap for your website and submit it to both Google Search Console and Bing Webmaster Tools. It is also good practice to specify your sitemap's location in your robots.txt file.

Your site's URLs contain unnecessary elements that make them look complicated.
A URL must be easy to read and remember for users. Search engines need URLs to be clean and include your page's most important keywords.
Clean URLs are also useful when shared on social media as they explain the page's content.

Embedded Objects such as Flash. It should only be used for specific enhancements.
Although Flash content often looks nicer, it cannot be properly indexed by search engines.
Avoid full Flash websites to maximize SEO.

Keep your URLs short and avoid long domain names when possible.
A descriptive URL is better recognized by search engines.
A user should be able to look at the address bar and make an accurate guess about the content of the page before reaching it (e.g., http://www.mysite.com/en/products).

When a visitor encounters a 404 File Not Found error on your site, you're on the verge of losing the visitor that you've worked so hard to obtain through the search engines and third party links.
Creating your custom 404 error page allows you to minimize the number of visitors lost that way.

Two of the main reasons for an increase in page size are images and JavaScript files.
Page size affects the speed of your website; try to keep your page size below 2 Mb.
Tip: Use images with a small size and optimize their download with gzip.

Site speed is an important factor for ranking high in Google search results and enriching the user experience.
Resources: Check out Google's developer tutorials for tips on how to to make your website run faster.

Make sure your declared language is the same as the language detected by Google
Also, define the language of the content in each page's HTML code.

Safe Browsing to identify unsafe websites and notify users and webmasters so they can protect themselves from harm.

The Doctype is used to instruct web browsers about the document type being used.
For example, what version of HTML the page is written in.
Declaring a doctype helps web browsers to render content correctly.

This is the number of pages that we have discovered on your website.
A low number can indicate that bots are unable to discover your webpages, which is a common cause of a bad site architecture & internal linking, or you're unknowingly preventing bots and search engines from crawling & indexing your pages.