Semrush: Keyword Research and Competitor Analysis – The Complete SEO Guide

Introduction

Search engine optimization (SEO) is one of the most effective ways to help a website reach its target audience through organic search. Whether you operate a personal blog, an affiliate website, an online store, or a digital marketing agency, understanding what people search for and how competing websites attract visitors can help you build a more effective online strategy.

However, successful SEO requires more than publishing articles and adding keywords to web pages. You need to understand your audience, identify relevant search opportunities, evaluate keyword competition, and develop content that provides greater value than existing alternatives.

This is where Semrush becomes useful.

Semrush is a digital marketing and SEO platform that helps users research keywords, analyze competitors, evaluate website visibility, and discover opportunities to improve their online presence. Its tools can help marketers understand which search terms attract visitors, what types of pages perform well, and where their websites may be missing opportunities.

For example, imagine that you run a website about digital marketing. You want to publish an article about email marketing, but you are unsure which keywords to target or which topics your competitors have already covered.

Using Semrush, you can research related search terms, investigate their estimated search volume and keyword difficulty, analyze competing websites, and discover content gaps that may be worth addressing.

Instead of choosing topics based entirely on guesswork, you can use research data to make more informed decisions.

In this comprehensive guide, you will learn what Semrush is, how keyword research works, how to analyze competitors, which tools can support your SEO strategy, and how to turn research findings into a practical content plan.

We will also discuss keyword selection, competitor keyword gaps, backlink analysis, common mistakes, advantages, limitations, and frequently asked questions.

Whether you are a beginner, blogger, affiliate marketer, business owner, or professional SEO specialist, this guide will help you understand how to use Semrush more effectively.

What Is Semrush?

Semrush is an online marketing platform that provides tools for search engine optimization, keyword research, competitor analysis, content marketing, advertising research, and other digital marketing activities.

It is widely used by marketers who want to understand how websites gain visibility in search engines and identify opportunities to improve their own performance.

Semrush provides data and reports that can help users investigate search demand, evaluate competing websites, and plan content around relevant topics.

Depending on the available tools and subscription plan, its capabilities may include:

• Keyword research and keyword difficulty analysis.
• Competitor keyword research.
• Organic search visibility analysis.
• Keyword gap identification.
• Backlink research.
• Website SEO auditing.
• Search position tracking.
• Content planning and optimization.
• Paid search and advertising research.
• Local SEO and selected AI visibility research features.

The platform’s available features and usage limits may change over time. Check the official Semrush website for the latest product information.

The main advantage of using an SEO research platform is that it brings multiple types of marketing data into a more organized workflow.

Rather than evaluating every opportunity manually, you can use research tools to narrow your options and determine which areas deserve further investigation.

However, Semrush does not guarantee higher rankings. Its data should be combined with actual search result reviews, audience research, quality content, and ongoing performance monitoring.

What Is Keyword Research in SEO?

Keyword research is the process of identifying and evaluating the words and phrases people enter into search engines when looking for information, products, services, or solutions.

These search terms help website owners understand their audience’s interests and plan relevant content.

For example, someone interested in starting a blog might search for:

• How to start a blog.
• Best blogging platforms for beginners.
• How to choose a blog niche.
• Blogging tips for beginners.
• How to make money blogging.

Each keyword reflects a slightly different need.

A person searching for “how to start a blog” may want a step-by-step tutorial, while someone searching for “best blogging platforms for beginners” is probably comparing available options.

Understanding these differences helps you create content that matches the searcher’s expectations.

Why Is Keyword Research Important?

Keyword research helps you:

1. Discover what your audience wants to learn.
2. Identify topics with relevant search demand.
3. Evaluate competition before investing time in content.
4. Find specific questions that your website can answer.
5. Organize related topics into a content strategy.
6. Improve the relevance of existing pages.
7. Discover commercial opportunities for products and services.

Without keyword research, you may spend considerable time publishing content that attracts little relevant traffic or fails to meet users’ needs.

Keyword research does not mean selecting only the keywords with the highest search volume. The best keywords are those that match your audience, your expertise, your business goals, and your website’s ability to compete.

What Is Competitor Analysis in SEO?

Competitor analysis is the process of studying other websites and businesses to understand how they attract visitors, target keywords, publish content, and compete for visibility.

In SEO, competitor analysis can reveal which topics other websites rank for, which pages appear to attract search traffic, and where your own website may have opportunities to improve.

For example, suppose you publish articles about fitness and notice that several competing websites rank for searches related to home workouts.

You can investigate their pages to understand the questions they answer, the formats they use, and the topics they cover.

You may discover that they publish beginner workout guides but provide limited information about exercising in small spaces.

That gap could inspire a useful article for your own audience.

The goal is not to copy competitors. It is to understand the market, identify unmet needs, and create content that serves readers more effectively.

Business Competitors vs. SEO Competitors

Business competitors and SEO competitors are not always the same.

Business competitors sell similar products or services to the same audience.

SEO competitors are websites competing for visibility on similar search queries.

For example, a company selling running shoes might compete commercially with other shoe brands. However, its SEO competitors could also include fitness blogs, running magazines, and product review websites.

These publishers may not sell the same products, but they compete for the attention of people searching for running advice.

A strong Semrush workflow considers both types of competitors when relevant.

Why Use Semrush for Keyword Research and Competitor Analysis?

Keyword research and competitor analysis are closely connected.

Keyword research helps you discover what people search for, while competitor analysis helps you understand how other websites address those searches.

Semrush brings these activities together through its available research and reporting tools.

1. Discover Relevant Keywords

You can explore keyword ideas related to a topic, product, service, or website.

This helps you move beyond obvious keywords and discover more specific search queries.

2. Understand Keyword Difficulty

Keyword difficulty estimates help you evaluate how competitive a search term may be.

These estimates are useful for prioritization, although they do not guarantee whether a particular page will rank.

3. Identify Competitor Opportunities

Competitor research can show which keywords other websites rank for and which topics they appear to target successfully.

This information can guide your own research.

4. Find Content Gaps

Keyword gap analysis helps identify relevant search terms that competitors rank for but your website may not target effectively.

These gaps can reveal opportunities for new articles or improvements to existing content.

5. Build a More Organized Content Strategy

By grouping related keywords into topics, you can plan content that addresses multiple connected questions without creating unnecessary duplicate pages.

6. Monitor Search Performance

Position tracking and other reporting features can help you observe how your target keywords perform over time.

You can use the results to decide which pages need attention.

Semrush’s official feature pages describe its keyword research and competitor analysis tools in greater detail. See the Semrush keyword research overview and the Semrush competitor analysis overview.

Main Semrush Tools for Keyword Research

Semrush offers several tools that can support different stages of keyword research. Their exact functionality and availability may depend on your subscription.

1. Keyword Overview

Keyword Overview helps users investigate an individual keyword and review available metrics and search-related information.

It can be useful when you already have a keyword idea and want to understand its potential before creating content.

For example, suppose you are considering the keyword “email marketing software.”

You might investigate:

• Estimated monthly search volume.
• Keyword difficulty.
• Search intent.
• Related keyword ideas.
• Search result characteristics.
• Potential competing pages.

These metrics provide a starting point for research.

However, do not make a decision based on a single number. A keyword with substantial search volume may be difficult to rank for, while a narrower query may attract a smaller but more relevant audience.

2. Keyword Magic Tool

The Keyword Magic Tool is designed to help users discover keyword ideas related to a starting term.

You can begin with a broad topic and explore related phrases, questions, and narrower subtopics.

For example, entering “content marketing” may help you explore related searches such as:

• Content marketing strategy.
• Content marketing examples.
• Content marketing for small businesses.
• Content marketing calendar.
• Content marketing tools.
• Content marketing metrics.

Each phrase may represent a different article idea or section within a larger resource.

The tool can help you organize a large set of potential keywords and narrow the list using available filters.

The important step is deciding which suggestions are genuinely relevant to your audience.

3. Organic Rankings

Semrush’s Organic Rankings tool, previously known as Organic Research, can help you investigate the search terms a website ranks for organically.

You can use it to examine your own website or research competing domains.

Depending on the report, you may find information about:

• Keywords associated with a website.
• Estimated organic traffic.
• Ranking positions.
• Pages associated with particular keywords.
• Changes in search visibility.
• Competing websites.

For example, you might discover that a competitor receives visibility for several beginner-focused tutorials while your website has only one general article covering the same subject.

This could suggest an opportunity to expand your content coverage.

Remember that third-party traffic and ranking figures are estimates, not direct access to a competitor’s private analytics.

4. Keyword Gap

Keyword Gap is designed to compare the keyword visibility of multiple websites.

It helps identify search terms that competing domains rank for but your website does not.

This is particularly useful when planning new content.

For example, imagine that your website publishes articles about website development, while competing websites cover topics such as website speed testing, image optimization, and mobile usability.

If those topics are relevant to your audience and your website lacks comprehensive resources about them, they may represent worthwhile content opportunities.

A keyword gap is not automatically a reason to publish a new article. You must still consider search intent, business relevance, competition, and the quality of the existing results.

5. Keyword Strategy Builder

Keyword Strategy Builder helps users organize keyword ideas into related topic groups and develop a more structured content plan.

Instead of treating every keyword as an independent article idea, you can group closely related searches together.

For example, a group of searches about “email marketing automation” might include questions about workflow setup, automated welcome messages, segmentation, and campaign triggers.

Depending on search intent, these terms may belong on one comprehensive page or several closely connected pages.

Topic grouping helps reduce unnecessary duplication and creates a clearer editorial roadmap.

6. Position Tracking

Position Tracking helps users monitor the rankings of selected keywords over time.

It can support reporting by showing how a website performs for chosen search terms under specified tracking conditions.

For example, you might monitor a group of keywords related to your most important service pages.

If rankings change significantly, you can investigate possible causes, such as search result changes, technical issues, updated competitors’ pages, or changes in your own content.

Rank tracking should be interpreted carefully because results can vary by location, device, search engine, and other conditions.

How to Do Keyword Research With Semrush: Step-by-Step Guide

The following process can help you move from a broad idea to a practical keyword plan.

Step 1: Define Your Website’s Main Topic

Before opening any keyword tool, identify the main subject of your website.

For example:

• A technology blog may focus on software, apps, and digital tools.
• A food blog may focus on recipes, cooking techniques, and meal planning.
• An education website may cover study methods, courses, and learning resources.
• An ecommerce website may focus on products, comparisons, and purchasing guidance.

Your main topic provides a foundation for identifying relevant keywords.

Avoid choosing search terms that have little connection to your website simply because they appear popular.

Step 2: Create a List of Seed Keywords

Seed keywords are broad phrases that describe your subject.

If your website focuses on SEO, your initial list might include:

• Keyword research.
• SEO tools.
• Competitor analysis.
• On-page SEO.
• Technical SEO.
• Link building.
• Content optimization.
• Local SEO.

These phrases can be used to discover more specific search terms.

Start with a manageable list of relevant topics rather than attempting to research every possible keyword immediately.

Step 3: Explore Keyword Ideas

Enter your seed keywords into an appropriate Semrush research tool.

Review the available suggestions and identify terms that