The robots.txt file is a simple text file placed on your web server which tells webcrawlers like Googlebot if they should access a file or not.

Improper usage of the robots.txt file can hurt your ranking. The robots.txt file controls how search engine robots see and interact with your webpages.

This file is mentioned in several of the Google guidelines. This file, and the bots they interact with, are fundamental parts of how search engines work.

Google has indicated site and page speed are part of the signals used by its algorithm to rank pages.

In addition, a slow page speed means that search engines can crawl fewer pages using their allocated crawl budget, and this could negatively affect your indexation.

Loading time is also important to user experience. Pages with a longer load time tend to have higher bounce rates and lower average time on page. Longer load times have also been shown to negatively affect conversions.

Check out the ways you can increase bidinghuo.cn's page speed.

HTML defines six levels of headings. A heading element implies all the font changes, paragraph breaks before and after, and any white space necessary to render the heading.

The heading elements are <H1>, <H2>, <H3>, <H4>, <H5>, and <H6> with <H1> being the highest (or most important) level and <H6> the least. They are used to help users and search engines to read and understand text.

For example, they act as signposts for the readers and make it easier for people to understand what a post or page is about.

Headings also define which parts of your content are important, and show how they're interconnected.

They are one of the key signals, along with many others, used by Google's search algorithm.

Here are some heading tags best practices.

Alt text is the written copy that appears in place of an image on a web page if the image fails to load on a user's screen.

This text helps screen-reading tools describe images to visually impaired readers and allows search engines to better crawl and rank your website.

bidinghuo.cn has 35 images with a missing alt attribute.

Although Google says social media is not a direct SEO ranking factor, the correlation between social signals and ranking position is extremely high.

Social media affects SEO in the sense all of the shares add up to more visibility for your content.

If lots of people share your content, then it’s likely more people will link to it, and links are a very important SEO ranking factor.