1. What is SEO?
SEO (Search Engine Optimization) refers to the set of techniques that improve the visibility of a website in search engine results. Concretely, when a user types a query on Google, SEO determines which sites appear first.
Why is it so important? Because the first three Google results capture more than 60% of all clicks. If your website is on the second page, it is practically invisible. SEO is therefore an essential lever for attracting qualified traffic to your website, without paying for each visitor as is the case with paid advertising.
Contrary to common misconceptions, SEO is not an obscure discipline reserved for insiders. It is a methodical approach that relies on three core pillars: technical (your website must be accessible and fast), content (you need to answer your visitors' questions) and popularity (other sites must recommend yours).
SEO vs SEA: What's the difference?
SEA (Search Engine Advertising) refers to paid advertisements that appear at the top of Google with the "Sponsored" label. You pay for each click. SEO, on the other hand, positions you in organic (natural) results. The advantage of SEO: once well positioned, your website attracts traffic for free during months, even years. It is a long-term investment that offers the best return on investment among all digital marketing channels.
2. How Google Works
To optimize your website, you need to understand how Google works. The process breaks down into three key steps: exploration, indexation and ranking.
Exploration (Crawling)
Google uses robots (the famous "Googlebots") that crawl the web by following links from one page to another. These robots visit your website, read the HTML code, follow internal and external links, and collect all available information. For Google to properly explore your website, your pages need to be accessible, your internal linking needs to be solid, and you must not have pages blocked by mistake.
Indexation
Once a robot has explored a page, Google analyzes it and decides whether to store it in its index. Google's index is like a giant library containing billions of web pages. If your page is not indexed, it can never appear in search results. You can verify the indexation of your pages by typing "site:yourdomain.com" in Google.
Ranking
When a user performs a search, Google draws from its index and ranks pages according to more than 200 criteria. Among the most important: content relevance to the query, site quality and authority, user experience (speed, mobile), trust signals (backlinks, site age) and search intent. Google's objective is simple: offer the best possible answer to each query.
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Contact our SEO experts arrow_forward3. Keyword Research
Keyword research is the foundation of any SEO strategy. It involves identifying the terms and expressions that your potential clients type into Google when they search for your products or services.
Types of keywords
There are generally three categories of keywords based on their length and specificity:
- Generic keywords (short tail): One or two words, highly searched but highly competitive. Example: "shoes". Difficult to rank for when starting out.
- Medium-tail keywords: Two to three words, moderate search volume. Example: "hiking shoes". A good compromise.
- Long-tail keywords: Four words or more, fewer searches but much easier to target. Example: "waterproof women's hiking shoes". Ideal for beginners because competition is low and purchase intent is high.
Tools for finding your keywords
Several free and paid tools help you identify the right keywords. Google Keyword Planner (free) gives you search volumes. Google Search Console (free) shows you the queries your website already appears for. Ubersuggest, Ahrefs and SEMrush (paid) offer more advanced analyses with ranking difficulty and competitor keywords.
How to choose your keywords
Prioritize keywords that combine a decent search volume, competition accessible for your level of authority, and search intent aligned with your offering. A keyword that generates 500 monthly searches with low competition is often more profitable than a keyword with 50,000 searches where you have no chance of appearing on the first page.
4. On-Page SEO
On-page SEO concerns all the optimizations you can make directly on your web pages. It is the pillar over which you have the most control.
The title tag
The title tag is the title that appears in Google search results. It is the most important on-page SEO element. Each page must have a unique title containing your main keyword, ideally placed at the beginning. Limit yourself to 60 characters to prevent Google from truncating it. A good title must be both optimized for search engines and attractive to humans.
The meta description
The meta description is the small text that appears under the title in results. It is not a direct ranking factor, but it strongly influences the click-through rate. Write an engaging description of 155 characters maximum, including your keyword and a call to action. Think of it like a mini advertisement for your page.
Heading structure (H1, H2, H3)
Use a clear heading hierarchy to structure your content. Each page should have only one H1 (the main title), followed by H2s for major sections and H3s for subsections. Naturally integrate your keywords into these headings. Google uses this structure to understand what your page is about and what main topics are covered.
Quality content
Google promotes content that brings real added value. Your content must be original, in-depth, well-structured and up-to-date. In 2026, quality trumps quantity. A well-written, well-documented 2,000-word article will always outperform ten poorly-written 300-word articles. Fully answer the user's question and provide concrete examples.
Images
Optimize your images with descriptive file names (avoid "IMG_1234.jpg"), relevant alt attributes containing your keywords, and modern formats (WebP) for fast loading. Well-optimized images can also bring you traffic via Google Images.
5. The SEO off-page
The SEO off-page englobe all the actions menees en dehors of your website for improve its positionnement. The factor main : the backlinks.
Qu'is-what a backlink ?
A backlink is a lien provenant of a other website that pointe toward the your. Google considere each backlink like a "vote of confiance". The more you receive of liens provenant of sites of quality and relevant in your thematique, more Google considere your website like fiable and autoritaire. But attention : all the backlinks are not all the same. A lien provenant of a site recognised in your field a infinitely more than value that a centaine of liens provenant of sites of bad quality.
How obtain backlinks
The strategys ethiques for obtain backlinks include the creation of content exceptionnel that the gens have envie of share, the guest blogging on sites complementary, the relations presse digitales, the technical of the broken link building (trouver liens casses on d'autres sites and offer your content en remplacement) and the creation of resources uniques like study, infographies or tools frees.
The signaux sociaux
Although the partages on the social media are not a factor of classement direct, they contribute a the visibility of your content and can generate backlinks naturels. A presence active on the social media renforce your brand and multiplies the opportunites d'obtain liens toward your website.
6. The SEO technical
The SEO technical s'assure that your website is easily explorable and indexable by search engines. It is the foundation on which rest all your other efforts SEO.
The vitesse of chargement
Google confirme that the vitesse of chargement is a factor of classement. En 2026, the Core Web Vitals (LCP, FID, CLS) are essentials. Your page must load en less of 2,5 seconds. For improve the vitesse : compressez your images, activez the mise en cache, use a CDN, minimisez the code CSS and JavaScript and choose a hosting high-performing. Test your website with Google PageSpeed Insights for identify the points a improve.
The responsive design
More than 60 % recherches itself do on mobile. Google uses now the indexation "mobile-first", this that means that he evaluated first the version mobile of your website. Your website must be perfectly lisible and navigable on all the appareils : smartphones, tablettes and ordinateurs. A site non-responsive is penalise in the results of recherche.
The certificat SSL (HTTPS)
Google prowordes the sites securises. Make sure that your website uses the protocole HTTPS (le cadenas in the barre d'address). It is a signal of confiance for Google and for your visitors. The plupart hebergeurs proposent certificats SSL frees via Let's Encrypt.
The fichier sitemap.xml
The sitemap is a fichier XML that liste all the pages of your website. Il aideally Google a discover and indexer your pages more quickly. Soumettez your websitemap via Google Search Console. The plupart CMS (WordPress, Webflow) generate automatically a sitemap.
The fichier robots.txt
Ce fichier indique to the robots quelles pages they can or cannot explorer. Make sure of not block by mistake pages importants. A robots.txt mal configured can empeexpensive Google d'indexer your website.
7. Measure your results
The SEO without mesure, it is like naviguer without boussole. Deux tools frees are essentials for track your performance.
Google Search Console
It is the tool number a for understand how Google voit your website. Il you montre the requetes that generate impressions ands clicks, your position average for each keyword, the erreurs d'indexation a corriger, the Core Web Vitals of your pages and the liens that pointent toward your website. Verify your Search Console to the minimum a fois per week.
Google Analytics
Google Analytics 4 (GA4) you gives a vision completeeeee of the comportement of your visitors. You can analyze the organic traffic (provenant of the SEO), the pages the most visitees, the bounce rate and the time passe on the site, the conversions generated by organic traffic and the parcours users on your website. Configure objectives (formulaires remplis, purchases, called) for measure the true impact business of your SEO.
The KPI essentials a track
- Trafic organic : The number of visitors venant of Google. It is your indicator principal.
- Positions averages : Ou isnt your pages for your keywords targets.
- Taux of click (CTR) : The pourcentage of people that cliquent on your result.
- Pages indexees : The number of pages of your website presentss in the index of Google.
- Conversions organics : The actions a value business generated by traffic SEO.
8. The erreurs classiques debutants
When on debute en SEO, some erreurs reviennent regularly. Here is the most commons and how the eviter.
Vouloir itself position on keywords too competitoriels
A new site does not have no chance of itself position on "assurance auto" face to geants of the sector. Start par keywords of long traine or you can really reach the first page, then elargissez gradually.
Negliger the user experience
A slow site, stuffed with ads or difficult to navigate will drive away your visitors, which sends a negative signal to Google. Take care of the user experience: intuitive navigation, fast loading, content readable on mobile.
Keyword stuffing
Repeating your keyword twenty times in a paragraph is counterproductive. Google detects this practice and can penalize your website. Write naturally for your readers and integrate your keywords smoothly.
Copying content from other sites
Duplicate content is the enemy of SEO. Google filters identical content and usually only keeps one version. Always create original content that brings your own perspective and expertise.
Ignoring technical SEO
have of the good content is not enough if your website is technicalment defaillant. Invest of the time in the foundations technicals : vitesse, indexation, structure URL, internal linking.
9. Prochaines etapes
You have now a vue d'together solideally of the SEO. Here is how passer a the action :
- Installowz Google Search Console and Google Analytics on your website. Ce are your tools of base.
- Do an audit of your website actuel. Identify the problems technicals, the pages without meta descriptions and the opportunites of keywords. Consult our checklist d'SEO audit for to not forget anything.
- Identify 10 keywords of long traine relevant for your activity and create a content of quality for chacun.
- Optimize your pages existantes : titles, meta descriptions, structure titles, vitesse of chargement.
- Travaillez the internal linking for relier your pages between they of way logique.
- Start a obtain backlinks en creant of the content that merite d'be partage and en contactant sites complementary.
The SEO is a marathon, not a sprint. The results significatifs apparaissent generally after 3 a 6 month d'efforts regulars. The key of the succes, it is the constance and the patience. Each amelioration that you apportez to your website contributes a a effet cumulatif which, on the duree, can transform radically your online visibility.
The SEO is the best investment digital a long terme. One euro invested in SEO returns on average 4 a 5 euros of revenue on 12 month.