Guides
Focused explanations for common website, network, and developer tasks.
How to audit a website
A practical workflow for reviewing SEO, technical, security, performance, and accessibility signals.
How to check DNS records
Understand the DNS records that help a domain route web traffic and email.
How to check an SSL certificate
Review certificate validity, identity, and expiration for a public HTTPS site.
HTTP status code guide
A concise reference for the response codes developers and site owners encounter most often.
DNS record types guide
A plain-language reference for A, AAAA, CNAME, MX, TXT, NS, SOA, and CAA records.
Website launch checklist
A focused checklist for the technical and user-facing details to verify before launch.
What is a backlink?
Understand relevant, editorial links and how useful resources earn attention without link spam.
What is a Website Score?
Learn what the SiteIndex diagnostic score measures, how categories are weighted, and where its limits are.
How to check a website score
Run a SiteIndex Website Score check, interpret the categories, and decide what to fix first.
What is robots.txt?
Learn how robots.txt guides compliant crawlers and how it differs from an XML sitemap.
What is an XML sitemap?
Understand what XML sitemaps contain, when they help discovery, and how to check one.
How to check website speed
Separate internet connection speed from website response time and choose the right diagnostic.
What are HTTP security headers?
Learn what common response security headers do and how to inspect them on a public URL.
What is JSON?
A practical introduction to JSON structure, formatting, validation, and common syntax errors.
How to check DNS propagation
Compare DNS results across multiple public resolvers to see whether a recent change has fully propagated.