Technical SEO is everything that has to work before content has a chance: search engines finding your pages, being allowed to index them, rendering them properly, and doing it fast enough that a visitor stays. It is unglamorous, largely invisible, and the single most common cause of a sudden drop nobody can explain.
Briefly explained
- Whether search engines can reach, read and render your pages.
- Most local sites need the basics, not advanced work.
- It decays with every rebuild, plugin and migration.
- The damage is usually invisible until traffic falls.
What does it actually cover?
Nearly everything that matters to a local business sits in five areas.
- Crawling and indexing: robots directives, canonical tags, sitemaps
- Redirects, especially after a rebuild or a domain change
- Speed, measured from real visitors. See Core Web Vitals
- Structured data, so the facts are unambiguous. See schema markup
- Mobile rendering and the accessibility basics that go with it
Why does it decay?
Because sites change, and nothing announces what broke.
A redesign drops the redirects. A staging site is left indexable. A plugin no-indexes half the service pages. A new hero image never gets compressed. Every one of those is a Tuesday afternoon, and every one of them is invisible until the traffic chart turns.
What usually causes a sudden drop?
In order of frequency, for local businesses:
- A rebuild launched without redirects from the old URLs
- A no-index directive left on from staging
- A migration that changed URLs without mapping them
- A hosting change that slowed the server response. See hosting
Content problems take months to show. Technical problems take days, which is the useful diagnostic when something falls off a cliff.
How do you keep it from happening?
- Read the Search Console coverage report monthly
- Re-crawl the site after every change, not once a year
- Treat a launch as the risk it is, with redirects mapped before go-live
- Keep a record of what was blocked deliberately, so nobody unblocks it by accident
What do the terms mean?
- Crawling: A search engine fetching your pages.
- Indexing: Deciding to store them for use in results.
- Canonical tag: A signal naming the preferred version of similar pages.
- 301 redirect: A permanent redirect, which carries most of a page’s value to its replacement.
- Robots.txt: The file setting the boundaries for crawlers.
Owner questions
