Technical SEO is the basis for ensuring that a website can be understood and indexed by search engines, involving key aspects such as crawling, inclusion, speed, mobile adaptation, secure connections, and URL structure. 1. The crawling ability affects whether the search engine can discover the page, and it is necessary to avoid robots.txt errors or excessive redirection; 2. Inclusion control ensures that the correct page is displayed, and use noindex tags and standardized tags to manage duplicate content; 3. Website speed optimization improves loading efficiency through compressing images, browser caches, etc.; 4. Mobile friendly requires design suitable for touch operations and avoiding pop-up interference; 5. Secure connections require HTTPS to ensure data transmission security; 6. A clear URL structure helps search engines identify page content. Although these technical details are inconspicuous, they are crucial to ranking and must be maintained regularly to maintain the best shape.

Technical SEO is the foundation of making your website understandable and indexable for search engines. It's not about content or backlinks — it's about how well your site is built and how easily search engines like Google can crawl, index, and serve your pages.

What Does Technical SEO Cover?

Technical SEO includes a bunch of behind-the-scenes optimizations that don't always get noticed by users but are critical for rankings. Think of it as housekeeping for your website from a search engine's perspective.

Here are some main areas it touches:

• Crawlability : Can search bots easily access and read your pages?
• Indexing : Are the right pages being indexed (and the wrong ones excluded)?
• Site Speed ??: How fast do your pages load on desktop and mobile?
• Mobile-friendliness : Is your site usable on phones and tablets?
• Secure connections : Do you use HTTPS to keep data safe?
• URL structure : Are URLs clean, logical, and descriptive?

These elements may not seem flashy, but if they're off, even the best content might never get seen.

Why Crawlability Matters

If Google can't crawl your site properly, nothing else matters. Crawling is how search engines discover your pages.

Common issues that block crawling:

• A messy robots.txt file
• Pages blocked by meta tags
• Poor internal linking
• Too many redirects or broken links

For example, if you accidentally block an important folder in robots.txt, Googlebot won't see those pages at all — and they won't show up in search results.

Fix this by regularly checking your crawl settings and using tools like Google Search Console to spot errors.

Indexing: Not All Pages Should Be Indexed

Just because Google can crawl a page doesn't mean it should index it. Duplicate content, thank-you pages, or staging environments shouldn't be live in search results.

Use these tools wisely:

• noindex tags for pages you don't want indexed
• Canonical tags to point to the original version of similar content
• Proper 301/302 redirects when moving or updating pages

If you have multiple versions of the same page (like www vs non-www), make sure you set a preferred domain in Google Search Console.

Site Speed ??and Mobile Usability

Search engines care about user experience — and slow sites hurt that. Especially on mobile, where loading times directly affect bounce rates.

To improve speed:

• Compress images without losing quality
• Use browser caching
• Minify CSS and JavaScript
• Choose a good hosting provider with fast servers

Google's PageSpeed ??Insights gives you a score and actionable suggestions. You don't need a perfect 100, but aim for at least "good" scores.

And don't forget mobile usability: avoid intrusive pop-ups, ensure tap targets are big enough, and test your site on real devices or emulators.

It's not magic — just solid setup and regular maintenance.
Basically that's it.

The above is the detailed content of What is technical SEO. For more information, please follow other related articles on the PHP Chinese website!