Concepts of Advanced On-Page SEO

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As marketers, helping search engines answer that basic question is one of our most important tasks. Search engines can’t read pages like humans can, so we incorporate structure and clues as to what our content means. This helps provide the relevance element of search engine optimization that matches queries to useful results.

Understanding the techniques used to capture this meaning helps to provide better signals as to what our content relates to, and ultimately helps it to rank higher in search results. This post explores a series of on-page techniques that not only build upon one another, but can be combined in sophisticated ways.

While Google doesn’t reveal the exact details of its algorithm, over the years we’ve collected evidence from interviews, research papers, US patent filings and observations from hundreds of search marketers to be able to explore these processes. Special thanks to Bill Slawski, whose posts on SEO By the Sea led to much of the research for this work.

As you read, keep in mind these are only some of the ways in which Google could determine on-page relevancy, and they aren’t absolute law! Experimenting on your own is always the best policy.

We’ll start with the simple, and move to the more advanced.

Keyword Usage

In the beginning, there were keywords. All over the page.

The concept was this: If your page focused on a certain topic, search engines would discover keywords in important areas. These locations included the title tag, headlines, alt attributes of images, and throughout in the text. SEOs helped their pages rank by placing keywords in these areas.

Even today, we start with keywords, and it remains the most basic form of on-page optimization.

On Page SEO

Most on-page SEO tools still rely on keyword placement to grade pages, and while it remains a good place to start, research shows its influence has fallen.

While it’s important to ensure your page at a bare minimum contains the keywords you want to rank for, it is unlikely that keyword placement by itself will have much of an influence on your page’s ranking potential.

2. TF-IDF

It’s not keyword density, it’s term frequency–inverse document frequency (TF-IDF).

Google researchers recently described TF-IDF as “long used to index web pages” and variations of TF-IDF appear as a component in several well-known Google patents.

TF-IDF doesn’t measure how often a keyword appears, but offers a measurement of importance by comparing how often a keyword appears compared to expectations gathered from a larger set of documents.

If we compare the phrases “basket” to “basketball player” in Google’s Ngram viewer, we see that “basketball player” is a more rare, while “basket” is more common. Based on this frequency, we might conclude that “basketball player” is significant on a page that contains that term, while the threshold for “basket” remains much higher.

TF-IDF - On Page SEO

For SEO purposes, when we measure TF-IDF’s correlation with higher rankings, it performs only moderately better than individual keyword usage. In other words, generating a high TF-IDF score by itself generally isn’t enough to expect much of an SEO boost. Instead, we should think of TF-IDF as an important component of other more advanced on-page concepts.

3. Synonyms and Close Variants

With over 6 billion searches per day, Google has a wealth of information to determine what searchers actually mean when typing queries into a search box. Google’s own research shows that synonyms actually play a role in up to 70% of searches.

To solve this problem, search engines possess vast corpuses of synonyms and close variants for billions of phrases, which allows them to match content to queries even when searchers use different words than your text. An example is the query dog pics, which can mean the same thing as:

• Dog Photos   • Pictures of Dogs   • Dog Pictures   • Canine Photos   • Dog Photographs

On the other hand, the query Dog Motion Picture means something else entirely, and it’s important for search engines to know the difference.

From an SEO point of view, this means creating content using natural language and variations, instead of employing the same strict keywords over and over again.

Synonyms and Close Variants - On Page SEO

Using variations of your main topics can also add deeper semantic meaning and help solve the problem of disambiguation, when the same keyword phrase can refer to more than one concept. Plant and factory together might refer to a manufacturing plant, whereas plant and shrub refer to vegetation.

Today, Google’s Hummingbird algorithm also uses co-occurrence to identify synonyms for query replacement.

Practical tips for better on-page optimization

As we transition from keyword placement to more advanced practices of topic targeting, it’s actually easy to incorporate these concepts into our content. While most of us don’t have the means available to calculate semantic relationships and entity occurrences, there are a number of simple steps we can take when crafting optimized content:

Keyword research forms your base

Even though individual keywords themselves are no longer enough to form the foundation of your content, everything begins with good keyword research. You want to know what terms you are targeting, the relative competition around those keywords, and the popularity of those terms. Ultimately, your goal is to connect your content with the very keywords people type and speak into the search box.

Research around topics and themes

Resist researching single keywords, and instead move towards exploring your keyword themes. Examine the secondary keywords related to each keyword. When people talk about your topic, what words do they use to describe it? What are the properties of your subject? Use these supporting keyword phrases as cast members to build content around your central theme.

When crafting your content, answer as many questions as you can. Good content answers questions, and semantically relevant content reflects this. A top ranking for any search query means the search engine believes your content answers the question best. As you structure your content around topics and themes, make sure you deserve the top ranking by answering the questions and offering a user experience better than the competition.

Use natural language and variations

During your keyword research process, it’s helpful to identify other common ways searchers refer to your topic, and include these in your content when appropriate. Semantic keyword research is often invaluable to this process.

Place your important content in the most important sections. Avoid footers and sidebars for important content. Don’t try to fool search engines with fancy CSS or JavaScript tricks. Your most important content should go in the places where it is most visible and accessible to readers.

Structure your content appropriately

Headers, paragraphs, lists, and tables all provide structure to content so that search engines understand your topic targeting. A clear webpage contains structure similar to a good university paper. Employ proper introductions, conclusions, topics organized into paragraphs, spelling and grammar, and cite your sources properly.

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