SEO Fundamentals — How Search Works, On-Page, Technical & Links

SEO Fundamentals: How Search Works, On-Page, Technical & Off-Page SEO

2 min readPublished 29 Jul 2026

SEO (Search Engine Optimisation) is the practice of improving your visibility in organic (unpaid) search results. Because so many buying journeys start with a search, SEO drives high-intent, cost-effective traffic — and SEO skills are in high demand.

How search engines work

Search engines crawl pages, index them, and rank them for a query based on relevance and quality. Your job is to help them understand and trust your content, and to genuinely be the best answer for the searcher.

Keyword research and search intent

Keyword research — find the terms your audience actually searches (using tools and Search Console).
Search intent — understand why they search: informational ("how to…"), navigational (a brand), or transactional ("buy…"). Match your content to the intent, or it won't rank or convert.

The three pillars of SEO

On-page SEO — optimising the content and HTML of a page: useful, relevant content; a clear title tag and meta description; sensible headings (H1/H2); descriptive URLs; internal links; and image alt text.
Technical SEO — helping search engines crawl and render the site: fast loading, mobile-friendliness, a logical site structure, HTTPS, XML sitemaps, no broken links, and structured data.
Off-page SEO — signals from elsewhere, chiefly backlinks (other reputable sites linking to you) which act as votes of trust, plus brand mentions and reputation. Earn links with great content — never buy spammy ones.

Content is central

Modern SEO rewards genuinely helpful, authoritative content that satisfies the searcher (Google's 'helpful content' and E-E-A-T ideas). Keyword-stuffed thin pages don't work.

Measuring SEO

Google Search Console — impressions, clicks, average position, indexing issues.
Analytics (GA4) — organic traffic, engagement and conversions.
Rank tracking for target keywords. SEO is a long game — track trends over months, not days.

Put it to work

Pick a page and list one on-page, one technical and one off-page improvement you'd make. Then try the SEO optimisation simulation.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

SEO drives high-intent traffic — interviewers test the pillars, intent and measurement.

Technical questions

How would you improve a page's SEO?+

Match content to search intent, optimise on-page elements (title, headings, internal links), fix technical issues (speed, mobile, indexing), and earn quality backlinks — all around genuinely helpful content.

How do you measure SEO success?+

Use Search Console (impressions, clicks, position, indexing) and GA4 (organic traffic, conversions), plus rank tracking — assessed over months as SEO is a long game.

Behavioural questions

Tell me about a time you researched something to solve a problem.+

Use STAR: how you investigated (keyword/audience/data research), what you found, the action you took and the result.

Real-world scenarios

“Organic traffic suddenly drops after a Google update.”+

Expected answer: Investigate calmly: check Search Console for issues and which pages/queries dropped, review the update's focus, assess content quality and technical health against it, and improve helpfulness and E-E-A-T rather than chasing tricks.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles

SEO SpecialistDigital Marketing ExecutiveContent Marketing Executive

Skills you're proving

Keyword researchOn-page/technical SEOAnalyticsContent

Recommended certifications

Google Digital Garage / Google Ads certificationsCIM (Chartered Institute of Marketing) qualifications

Career progression

SEO Specialist → Senior SEO / SEO Manager → Head of Organic/Growth.

What employers expect

That you understand the customer, can plan and run data-driven campaigns across the right channels, write clear on-brand content, measure results against objectives, and keep learning fast in a changing digital landscape.

Frequently asked questions

What is SEO?

Search Engine Optimisation — improving a site's visibility in organic (unpaid) search results by helping search engines understand and trust your content and by being the best answer for the searcher.

What are the three pillars of SEO?

On-page (content and HTML like titles, headings and internal links), technical (crawlability, speed, mobile, structure), and off-page (backlinks and reputation).

What is search intent and why does it matter?

The reason behind a search — informational, navigational or transactional. Matching your content to the intent is essential for ranking and converting.

Practise what you've learned

Turn this guide into real, evidenced progress

Missiora helps you measure, improve and evidence the capabilities employers actually value — start with the tools best suited to this topic.

Published by

Missiora

Missiora is an AI Employability Intelligence platform. Our resources are researched and reviewed by the Missiora team to help you measure, improve and prove your career readiness.