HTTP/2 vs HTTP/3: what should I enable on my CDN?
Enable both. HTTP/2 is the dependable base and HTTP/3 adds QUIC for lossy networks. Learn how browsers pick one, and what to check after switching.
Guides
Practical, step-by-step website launch and SEO health guides.
Categories: All (247)
Showing 145 to 168 of 247 guides (page 7 of 11)
JSON-LD vs Microdata: which should I use?
Learn the difference between JSON-LD and Microdata structured data, why Google recommends JSON-LD, and when Microdata is still a reasonable choice.
Lighthouse score vs real user data: which matters?
Lighthouse tests one simulated page load, while real user data records actual visits. Learn how to use each one and which to trust for decisions.
noindex vs Disallow: what is the difference?
Disallow stops crawling and noindex stops listing in search. Learn which to use, why combining them fails and how to apply each correctly.
Should URLs be lowercase?
Yes, keep URLs lowercase. Find out why uppercase letters create duplicate pages and how to redirect mixed-case URLs to a single lowercase form.
Subdomain or subfolder for SEO?
Compare subdomains and subfolders for a blog, shop or help centre, and see which fits your setup, tracking and maintenance needs best.
Trailing slash or no trailing slash on URLs?
Should your URLs end with a slash? Learn how Google treats both forms, how to choose one and how to redirect and canonicalize the other.
WebP vs JPEG vs PNG: which format is best?
Compare WebP, JPEG and PNG for website images: when each fits, how they differ on quality, transparency and size, and how to switch safely.
What are caching headers (Cache-Control)?
Cache-Control tells browsers and CDNs how long to keep a file. See the common values, a safe setup for pages and assets and how to check them.
What are good Core Web Vitals scores?
The target numbers for LCP, INP and CLS, how the 75th percentile rule works and what Needs improvement and Poor mean, in one short reference page.
What are Open Graph tags?
Open Graph tags are meta tags that set the title, description and image shown when your page is shared on social sites and in chat apps. See the main tags.
What are render-blocking resources?
Render-blocking resources are CSS and JavaScript files that stop a page from showing anything until they load. Learn how to spot and unblock them.
What causes layout shift (CLS)?
The usual culprits behind a poor CLS score: images without sizes, late embeds, injected banners, web fonts and animations. Learn how to spot each one.
What do Google and Yahoo require from bulk email senders?
A plain summary of the Google and Yahoo bulk sender rules: SPF, DKIM, DMARC, one-click unsubscribe and spam complaint limits, with where to confirm them.
What does 'p 0' in DMARC mean?
Find out why p=0 is not a valid DMARC value, what people usually mean by it, and how to correct the record using p=none or pct=0 correctly.
What does \"Crawled, currently not indexed\" mean?
Googlebot has visited the page but not added it to search. See what the status means, the likely reasons and what to improve before you wait.
What does \"Discovered, currently not indexed\" mean?
Google knows the page exists but has not crawled it yet. Learn why that happens and which site changes make a crawl more likely.
What does \"Sitemap could not be read\" mean?
Understand the Search Console status \"Sitemap could not be read\", the usual causes behind it and the checks that show which one applies to your file.
What does a correct DMARC record look like?
See copy-ready DMARC record examples for monitoring, gradual enforcement and full reject, with the syntax rules that make a record valid.
What does a noindex tag do?
A noindex tag asks search engines to leave a page out of results. See how to add it, how to confirm it works and the mistakes that break it.
What does pct= mean in a DMARC record (and what is pct=0)?
Learn how the DMARC pct= tag works, why it defaults to 100, what pct=0 asks receivers to do, and how to use it to roll out enforcement gradually.
What does rua= mean in a DMARC record?
Find out what the rua= tag does in a DMARC record, what an aggregate report contains, how to write the mailto: address and send reports elsewhere.
What does ruf= mean in a DMARC record?
Understand the ruf= tag in a DMARC record, how failure reports differ from rua summaries, the fo option, and why many receivers never send them.
What file size should website images be?
There is no official image file size limit. Get practical size ranges for hero, article and thumbnail images, plus the steps that shrink a heavy picture.