A Jam-Packed Guide on Internal Linking for SEO – Kiến thức học SEO mới cập nhật theo Google.

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A Jam-Packed Guide on Internal Linking for SEO | Học SEO TOP Google tại nhà.

Chain links connect two ends of a fence together much like internal webpage links.
Inbound link building strategies tend to get a lot of attention in SEO. But your internal link strategy — the way you link between webpages in your own site — can greatly impact SEO and the user experience.

In this guide, I explain why internal linking is important and how to build a good internal link strategy for your website. I also give examples of effective internal links and best practices to keep in mind.

In this guide:

An internal link is a link that takes a user from one page on a website to another page on the same website. Internal links are different from external links, which point to a page on another website. Internal links are also different from inbound links, which point to a page on your website but come from another website.

Graphic illustrating the difference between internal links, inbound links and external links.

Examples of internal links include:

  • Main navigation
  • Footer links
  • Contextual links
  • Related content links

Main navigational links are the primary way that visitors navigate a website. These links can be found horizontally or vertically as part of the website’s main menus.

Main navigation links point to the most important webpages on a website. They are usually implemented across the entire site, so they’re available from every page.

BruceClay.com main menu navigation links.
BruceClay.com main menu navigation links

Navigation menus can be lengthy lists of links to primary and secondary section main pages. The examples below show how this might look on an ecommerce website and a retail website.

LaLaDaisy.com main navigation menu.
LaLaDaisy.com main navigation menu
HomeDepot.com main navigation menu links.
HomeDepot.com main navigation menu links

Footer links, like main navigational links, help a person navigate through a website. Links in the footer usually represent webpages that people may find important, but less important than the main navigation links. Footer links are usually implemented across the entire site.

BruceClay.com footer links.
BruceClay.com footer links

Contextual links are links embedded within the main content on a webpage. These links point to another webpage using anchor text (which is the hyperlinked words) so that the link appears in context within a page.

For example, this link to our guide on SEO siloing (which I’ll discuss more later in this article) is a contextual link using the anchor text “SEO siloing.” And, you can find contextual links within that guide, too:

Screenshot of the SEO Siloing guide on BruceClay.com, contextual link.
Screenshot of the SEO Siloing guide on BruceClay.com, contextual link

Internal related content links often show up at the bottom of an article. They suggest to visitors what content they might be interested in reading next.

Screenshot of related content linked from a BruceClay.com blog article.
Screenshot of related content linked from a BruceClay.com blog article

Internal links serve important functions for both website visitors and search engines. Internal links:

Help Users Find Content

Internal links help you direct your website visitors to important webpages on your site, whether they are main navigational links, contextual links or something else. Ideally, interested readers can also follow links to dive deeper into any topic that your site covers, moving logically from page to page.

Help Search Engines Figure Out Your Website

When internal linking is done well, it helps to communicate to the search engines what your website is about. Organizing content through links helps your site to be a relevant authority on a topic (more on that later).

Help Search Engines Discover More Webpages

Search engine crawlers use the links they find to discover and crawl more webpages on your website. The more webpages they discover, crawl and index, the better. From Google:

Some pages are known because Google has already visited them before.

Google’s PageRank algorithm assesses the authority of a webpage. If one webpage is considered high authority (usually due to quality external links pointing to it) and that webpage links to another webpage internally, it passes some of its authority to the page it is linking to.

How To Do Internal Linking for SEO and User Experience

When you get your internal linking structure right, you have not only a well-organized website that visitors can easily navigate but also a site that is primed for SEO.

SEO Siloing

SEO siloing is a practice we invented in 2000. SEO siloing is a way to organize your website content through links based on the way people search for your site’s topics. Its goal is to make a site more relevant for a search query, which gives the page a better chance of ranking.

As an example, say you have a website that sells power tools. You can organize the content on that website through its linking structure so that it is like a well-kept file cabinet.

Sample SEO siloing structure for a website.
Sample SEO siloing concept for a fictional power tools website

In the graphic above, the “cordless power tools” category of content consists of a landing page and several supporting webpages on the website, all of which are linked to one another to create a “silo” of information.

Google states this is a good practice:

The navigation of a website is important in helping visitors quickly find the content they want. It can also help search engines understand what content the website owner thinks is important. Although Google’s search results are provided at a page level, Google also likes to have a sense of what role a page plays in the bigger picture of the site.

Google reinforces that in its SEO Starter Guide, too:

Make it as easy as possible for users to go from general content to the more specific content they want on your site. Add navigation pages when it makes sense and effectively work these into your internal link structure. Make sure all of the pages on your site are reachable through links, and that they don’t require an internal “search” functionality to be found. Link to related pages, where appropriate, to allow users to discover similar content.

SEO siloing is done through interlinking between pages, and it can be reinforced via the physical directory structure. I’ll explain more about that next.

Physical Siloing

Physical siloing is the practice of interlinking webpages by the URL structure into directories. An example I often use in our SEO training course is on a fictional website about peanut butter. You could create a silo on creamy peanut butter through the physical directory of a website like so:

peanutbuttersite.com/creamy/traditional/
panutbuttersite.com/creamy/organic/
peanutbuttersite.com/creamy/lowfat/
peanutbuttersite.com/creamy/jellyhybrid/
peanutbuttersite.com/creamy/honeyroasted/

When done right, the main navigation of a website will point to these physical silos.

Here’s a sample of physical siloing on our site under the “what we do” navigation:

bruceclay.com/seo/
bruceclay.com/seo/training
bruceclay.com/seo/tools

… and so on.

To strengthen your silos, be sure to have the primary page of each silo link down to its next-level main pages. Also have each subpage within the directory link up to the directory’s main landing page.

As a general rule, you need a minimum of five content pages to establish the theme of the directory/silo. Sometimes, one of those five pages (or more) may serve as the landing page for a new subsection.

Virtual Siloing

Virtual siloing is the practice of creating an informational silo through contextual links and related webpages. The pages that are linked together are not necessarily in the same directory but are relevant to one another. Virtual siloing is useful for a website in times where a physical directory is not a good option.

Let’s say you have two different physical silos, each with five subpages of supporting content. If you wanted to link to a page in another silo, you would link to the other silo’s main landing page, not a subpage.

The reason for this is to not dilute the theme of the silo. One reason for internal linking is to group similar subjects together and help search engines understand what each section is about. If a lot of subpages link to a lot of other subpages, it can get confusing.

Our SEO siloing guide explains this further:

Sticking with the simple peanut butter example, say your site sells a flavor of jelly that is particularly complementary to creamy peanut butter. It may be fitting to link from your peanut butter page to the flavored jelly page. Since the jelly page would be a supporting page in the jelly silo, you would want to link your creamy peanut butter page to the landing page of the jelly silo instead of to the particular flavored jelly page.

You can learn a lot more about SEO siloing by reading our SEO siloing guide or checking out our online SEO training course.

Internal Linking Best Practices

Aside from siloing, there are many other internal linking best practices that will enhance user experience and SEO. Here a list that I’ll explain in detail below:

If your website is not brand new, you likely already have an internal link structure. To get a better picture of what it looks like, you can use SEO tools such as:

Using tools, audit your internal links to find things like:

If you are an SEOToolSetⓇ subscriber, you can use our Link Graph tool to get started analyzing your internal links as an interactive visual map. But, there are other tools, too, as mentioned in this guide.

Link Graph tool in SEOToolSet.
Link Graph tool in SEOToolSetⓇ

Establish Click Depth

Traditional wisdom says that the number of clicks it takes to get to important pages on the site from the homepage should be no more than three. Google has confirmed that it is important to make sure it’s easy to get to these important pages easily, but makes no mention of actual click depth.

In that video, Google’s John Mueller says:

…What does matter for us a little bit is how easy it is to actually find the content there. So especially if your home page is generally the strongest page on your website, and from the home page it takes multiple clicks to actually get to one of these stores, then that makes it a lot harder for us to understand that these stores are actually pretty important.

So in other words, you do want to keep click depth in mind as you are establishing your silos, and we usually recommend that, if possible, the site’s click depth not be more than two or three jumps from the homepage.

Your website’s homepage is typically the page with the most authority. So choose the links wisely that you put on your homepage. Only point to the most important pages (usually the main landing pages of your silos).

Here’s an example on HomeDepot.com’s homepage:

HomeDepot.com main navigation links from homepage.
HomeDepot.com main navigation links from homepage

Breadcrumb links help to orient website visitors as to where they are in the site. It can help them navigate back and forth easily. Google recommends this as a best practice, too:

A breadcrumb is a row of internal links at the top or bottom of the page that allows visitors to quickly navigate back to a previous section or the root page. Many breadcrumbs have the most general page (usually the root page) as the first, leftmost link and list the more specific sections out to the right. We recommend using breadcrumb structured data markup28 when showing breadcrumbs.

Here at BCI, we recommend using breadcrumb links at the top of your pages.

Breadcrumb links on BruceClay.com.
Breadcrumb links on BruceClay.com

Use Anchor Text Wisely

An important factor in determining the quality of a link is its anchor text. You want anchor text to be meaningful and relevant for internal links to your site.
Yes, keyword-rich anchor text should be used within your own website. There’s no spam penalties on internal linking. So make those internal links reinforce what each page is about. Typically, you’ll want to use one of the destination page’s main keywords as anchor text.

Google agrees:

Links on your page may be internal—pointing to other pages on your site—or external—leading to content on other sites. In either of these cases, the better your anchor text is, the easier it is for users to navigate and for Google to understand what the page you’re linking to is about.

Use Nofollow Attributes as Needed

Links to influencers, affiliates and some others must include an attribute like nofollow to prevent the transfer of link equity. Google expanded the list with sponsored and user-generated content designations. (This applies mostly to external links.)

It has been debated whether you should link out to another internal webpage more than once on the same webpage. Some argue it could dilute the PageRank (link equity).
In 2019, Google’s Mueller said this: