Critical PHP and Node.js vulnerabilities: what happened and what to do
On October 21, PHP and Node.js shipped fixes for serious flaws that allow code to run on the server. What they mean in plain language, which versions fix them and what to do this week.
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Critical PHP and Node.js vulnerabilities: what happened and what to do
On October 21, PHP and Node.js shipped fixes for serious flaws that allow code to run on the server. What they mean in plain language, which versions fix them and what to do this week.
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How can you tell how popular a website is?
What domain popularity lists such as Tranco measure, why they matter since Alexa closed, what they do not tell you about a site's traffic, and how to use them to compare competitors or judge a link.
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Your public IP address: what is it, and what does it reveal?
The difference between a public and a private IP, why yours changes, what a server can and cannot learn from it, and why support teams and allow-lists ask for it.
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What is a Unix timestamp, and why do so many systems use it?
What a Unix timestamp actually counts, how to tell seconds from milliseconds, where UTC and ISO 8601 come in, what the year 2038 problem is and which mistakes appear when systems are connected.
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How to recover a site’s old URLs before migrating it
Why the URL inventory is the step that saves the most traffic in a migration, which sources to build it from (Search Console, server logs, the Wayback Machine), and how to turn it into a redirect map.
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Does HTML validation matter for SEO?
Google does not penalise invalid HTML for being invalid, but some errors change what Google reads from your page. Which ones they are, how to spot them in a validator report and which can wait.
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Why are forgotten subdomains a security risk?
How certificate transparency puts every subdomain you have used on public display, what a subdomain takeover is, and how to build an inventory so you can clean up what you no longer need.
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Which GA4 events should your online shop track?
Why badly configured analytics leads to bad decisions in e-commerce, which ecommerce events Google recommends for GA4, what data each one should carry and how to check they work.
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What is IndexNow, and is it worth using?
How IndexNow works, the protocol for telling search engines a page has changed, which search engines use it and which do not, how the key is verified, and when it genuinely helps.
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Cron expressions explained: how to read and write them
The five fields of a cron expression, the four symbols that combine them, business examples, and the mistakes that make a job run at the wrong time or on the wrong days.
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What to automate first when everything looks automatable
A method for choosing your first automation without spending the budget on the wrong workflow - how to measure what manual work actually costs, and which signals mean a process is not ready yet.
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Migrating off WordPress without losing your SEO
The full process we follow on every migration - what to measure before touching anything, how to build the redirect matrix, and what to watch through the thirty days after launch.
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What to do if Google flags your site as dangerous
Why Chrome's red screen appears over a website, what is usually behind it, how to clean the site properly and how to ask Google to lift the warning.
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How do broken links affect your website and your SEO?
Where broken links come from, what they do to the people who click them and to the search engine crawling your site, how internal and external ones differ, and where to start fixing them.
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How to find out what a website is built with
The clues any site leaves about its CMS, its framework and its hosting, how far you can trust them, and why it helps to know before a redesign or a migration.
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What is hreflang, and how do you set it up without errors?
What hreflang does on a site with several languages or countries, why it has to be reciprocal, what x-default is, how language and region codes are written, and the mistakes that make Google ignore it.
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How to create strong passwords and actually manage them
Why length beats symbols, what a password manager does, which kind of two-step verification to choose and how to bring order to a team's passwords.
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How to check if your password was leaked
What a password breach is, why a password stolen from one service puts all the others at risk, and how to check one without handing it to anyone.
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301 vs 302 redirects: what is the difference?
What each redirect code means (301, 302, 307 and 308), when to use which, why chains and loops cost visits and rankings, and why sending everything to the home page is not a fix.
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Why does a DNS change take time to propagate?
Why a DNS change does not show up the same way everywhere, the role the TTL plays, how to prepare a change so the wait is minutes, and why your colleague sees the new site while you still see the old one.
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What is an XML sitemap, and what should yours contain?
What an XML sitemap is for, when you need a sitemap index, what limits the protocol sets, why the modification date matters more than priority, and which URLs should not be in it.
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What is Open Graph, and why does your link show no image?
What Open Graph and Twitter tags are, what image a shared card needs, why social networks keep showing the old version and the mistakes that leave a link blank.
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What is a vulnerability, and why does your website need maintenance?
What a software vulnerability is, why small websites are exposed too, what happens between the day a flaw is published and the day someone exploits it, and what keeping a site up to date actually involves.
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What happens when a domain expires?
What happens from the day a domain lapses until someone else can buy it, what stops working first, and how to make sure it never happens to you without warning.
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What is structured data, and what can you expect from it?
What structured data is, why JSON-LD is the recommended format, which rich results it can unlock, how required and recommended properties differ, and what it does not guarantee.
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LintGrafía: spell-check a website the way your customers see it
Introducing LintGrafía, a Chrome extension that checks spelling and grammar on the rendered page, on localhost and staging too. What it does, how it works and what happens to the text it reviews.
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HTTP security headers: which ones does your website need?
What HSTS, CSP, X-Frame-Options and the other security headers are, which attack each one stops, and in what order to switch them on without breaking anything.
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What are UTM parameters, and how do you use them well?
What each of the five UTM parameters does, how to name them so your reports do not split, which mistakes keep coming up and why they never belong on internal links.
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What robots.txt does, and how to decide what to do about AI crawlers
How a robots.txt file is written, why blocking a URL does not remove it from Google, which rule wins when two disagree, and what your options are with GPTBot, ClaudeBot and the rest.
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How to write title tags and meta descriptions
What title tags and meta descriptions are, how Google uses them in results, why it truncates them by pixels rather than characters, when it rewrites them and how to write them so people choose you.
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WhatsApp click-to-chat links for your business
What a wa.me link is, how to write the number so it works, which message to leave ready, where to place it and how to tell which channel each conversation comes from.
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What are SPF, DKIM and DMARC, and why do your emails land in spam?
The three DNS records that decide whether a mail server trusts your messages, how they fit together, and the configuration mistakes that send perfectly legitimate email to spam.
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What are Core Web Vitals, and how do you read them?
What LCP, INP and CLS measure, which figures count as good, why real user data does not match your Lighthouse score, and where to start when a metric turns red.
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Why does web accessibility matter?
Who gets shut out when a site is not accessible, what exactly gets checked to make it so, and why almost everything it takes is the same work that already improves usability and rankings.
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Responsive design: why it still matters and what actually gets measured
Adapting is not "does it fit on a phone". It is a continuous range of widths, densities and proportions, and four concrete measurements decide whether your site works on your visitor's device.
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Images for your website: which format to use and what size
When to use JPG, PNG, WebP, AVIF or SVG explained without jargon, the dimensions each kind of image needs -product, cover, hero, logo- and what to check before uploading a file to your site.
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What is an SVG, and why is it worth using?
Why your logo should be an SVG, what makes it different from a PNG, why the one your designer exports weighs ten times what it needs to, and what can be stripped out without breaking it.
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How do QR codes work?
What is inside those little squares, why they still scan with a logo on top or half scratched away, and the four rules that separate a QR code that works from one nobody can read.
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Backlinks: more than links, authority and reputation
Chapter 7 and last of the SEO from zero guide. What a backlink actually is, why a link works as a vote of confidence, how to earn them without risking a penalty, and why internal linking is the part you fully control.
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Search intent: the absolute key to keyword research and SEO
Chapter 6 of the SEO from zero guide. What search intent is, how to verify it by reading the results page, and how to pick terms by weighing traffic against difficulty, with a full worked example.
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What is usability from your user's perspective? And a few tips
Chapter 5 of the SEO from zero guide. How usability differs from user experience, the four principles of a usable interface, and what to check in your server, your HTML and your visual design.
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Everything you need to know about how a search engine works
Chapter 3 of the SEO from zero guide. Crawling, indexing and ranking explained without jargon, why the engine does not go looking when you type, and which part of the process you can actually influence.
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From keywords to experiences: how search engines have evolved
Chapter 4 of the SEO from zero guide. Why a search engine stopped selling links and started selling curated experiences, how that shift made trick-based SEO obsolete, and what it means that SEO is now technical and anthropological at once.
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Access to information: how search engines changed the world
Chapter 2 of the SEO from zero guide. How we answered our questions before search engines, the three types of search that still shape every strategy, and what became of the SEO statistics we quoted in 2019.
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The digital customer: 10 keys to understanding your buyers today
Chapter 1 of the SEO from zero guide. How we went from using the internet to living inside it, told in five moments, and the ten practical consequences for any brand that wants to be found.
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SEO from zero: the complete guide to search rankings
The index to our seven-chapter guide to organic search, written for people who are not developers - what each chapter covers, what has changed in search since we published it, and the order worth reading it in.
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How do you contact a business through Google Maps?
Google switched off Business Profile chat in July 2024. Here are the contact routes the map still gives you, how a customer actually uses them while deciding, and what to get right if the business is yours.
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