Best Search Engine Optimization (SEO) Services

What this guide gives you

This post explains what professional Search Engine Optimization (SEO) services commonly include, practical questions to ask agencies or freelancers, technical verification steps you can run yourself, and safe approaches to backlinks and paid placements. Read on to identify the deliverables that matter and the red flags to avoid.

Core SEO service areas

A complete SEO engagement usually covers several distinct disciplines. Vendors might specialise in one area, or offer a blended package. Expect clear scope and deliverables for each area below.

Technical SEO

Technical SEO fixes issues that affect crawling, indexing and site performance. Typical tasks include site architecture, canonicalization, XML sitemaps, robots directives, HTTP status checks, structured data implementation, Core Web Vitals remediation, and mobile rendering checks. Remember: Google uses the mobile version as its primary basis for crawling and indexing; since July 2024 Googlebot Smartphone is the default crawler used for Search.

Content and on-page SEO

Content work covers keyword research aligned with user intent, content structure, meta tags, headings, internal linking, and creating or optimizing pages to answer searcher needs. With AI Overviews and other generative features now common in results, high-quality, clearly structured content that satisfies user intent is increasingly important for visibility across multiple result formats.

Local SEO and listings

Local SEO includes Google Business Profile optimisation, accurate NAP (name, address, phone) data, local citations, review management and on-page signals that influence local pack visibility. Providers should clearly state whether they manage your listings directly or provide instructions for you to apply changes.

Link acquisition and outreach

Professional link-building focuses on editorial context, relevance and indexability. When a vendor proposes paid placements or sponsored content, confirm how links will be marked and how the publisher’s pages will be validated for indexability and audience fit. See the link policy section below for required disclosures and attribute examples.

How to evaluate an SEO provider

Effective evaluation blends process, transparency and measurable outcomes. Below is a practical checklist you can use in calls, proposals and contracts.

Checklist for proposals:

• Clear deliverables and milestones (what will be delivered and when)
• Access requirements and ownership of changes (who makes edits; what remains yours)
• Reporting cadence and the metrics those reports will include
• Case examples that match your industry and challenge (not generic 'we improved rankings' summaries)
• A clear stance on paid placements: how links are disclosed and which link attributes will be used

Red flags to watch for

Watch for vendors who promise guaranteed rankings, insist on secretive link networks, or request payment before any scope or contract is written. Beware of claims that focus solely on third-party authority metrics (Domain Authority, Domain Rating) as substitutes for editorial relevance and indexability—those metrics are third-party tool scores, not Google properties or ranking promises.

Technical verification and troubleshooting

When a provider claims they fixed crawling, indexing or performance problems, verify with these tools and commands. For deeper implementation details, Read the Technical SEO Guide.

Crawl, index and rank—keep the terms separate

Crawling is discovery and fetching. Indexing is what Google chooses to store and make retrievable. Ranking is how results are ordered for a given query. Fixing crawl errors doesn’t automatically change rankings, but it’s a required step if important pages are not being fetched or indexed.

Quick external checks you can run

These checks can be performed without access to the publisher's Search Console.

• curl -I <URL> — shows HTTP response headers only (status, server headers, and robots-related headers). Use this to confirm a page returns 200 OK or to inspect redirects.
• curl -A "Googlebot/2.1 (+http://www.google.com/bot.html)" <URL> — fetches the HTML the server will return for that user-agent. Use this to check server-side content differences for crawlers vs other agents.
• Chrome DevTools (Elements & Network) — inspect the rendered DOM to confirm a link is visible to users and not inserted only after client-side JavaScript executes in a way that Google may or may not process.
• Rich Results Test and Schema Markup Validator — validate structured data and check whether Google recognizes it as eligible for rich features.
• Bing Webmaster Tools Site Explorer — useful to see how Bing crawls and indexes pages.

Link acquisition, paid placements and Google's policy

If your SEO service includes link buying, sponsored posts or marketplace placements, confirm how links are disclosed and implemented. Google’s guidance is that links primarily intended to manipulate rankings can be treated as link spam. Paid or sponsored links should use rel attributes that reflect the nature of the placement.

HTML examples for link attributes you may see:

• A standard editorial link (no rel attribute): example.
• A disclosed paid or sponsored link: example.
• A user-generated content link: example.

Note: there is no rel=\"dofollow\" attribute; 'dofollow' is industry shorthand for a normal link that does not include rel=\"nofollow\", rel=\"sponsored\" or rel=\"ugc\".

A responsible provider should document which attribute will be used for paid placements and should verify that the publisher’s pages are indexable and part of an editorial context relevant to your audience.

Common deliverables and reporting

Good proposals list deliverables, not vague promises. Example deliverables include technical audit reports with prioritized issues, a roadmap of fixes, content briefs, a list of validated external placements with URLs and screenshots, and regular performance reports that tie activities to measurable signals.

When to keep SEO in-house vs hire an external service

In-house teams are effective when you need tight product integration, fast iteration and ownership of content. External providers add value when you need specialist skills, extra bandwidth, or access to wider editorial relationships. Hybrid approaches are common: an agency handles technical remediation and outreach while an internal team owns content strategy and publishing.

Whatever model you choose, require transparency: roll-up reports, access to change logs, and a handover plan so improvements remain durable after the engagement ends.

FAQ