Search engines can search any level of Web site pages.

But in the actual search process, search Spider for the home page need to click 3 times and more times to enter the page (three level page and more in-depth page) no longer pay attention to, thus slowing down, stop search.

That is to say, if your web page goes deep into the fourth layer in the link structure of the website, like the following example:

51tui.com/dir1/dir2/dir3/dir4/deep-page.htm

Such pages can not find links on the front page and secondary pages. People can only browse through the links on the three level page, and are often buried in the web site.

Similarly, search Spider rarely searches for deeper web pages after searching the main page quickly.

Therefore, they are less likely to be searched.

However, if you add a link to the page on the front page, although this page is still in the fourth level from the perspective of content structure, it can still be easily found by searching the Spider through clicking the homepage link.

With some exceptions, pages that are deeper than 4 can be easily searched.

That is, if other websites link up the page on their top page, the effect will be as if you made the link on your home page.

But obviously, no one can control others to do such a link, so in reality, it is impossible to operate.

If you have a deep page that is constantly updated, make sure that the updated page is easy to search.

It is best to avoid more than 4 layers of web pages.

Another way is to create a website map, which lists links to all pages, and then links the map to the front page.

In this way, all pages can be searched through secondary pages.