platzi.com

Readiness by lane

Green: platzi.com. Thin bar: Education & Online Learning peer median.

Priority fixes for platzi.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   HSTS kept for at least a year

   Observed: Strict-Transport-Security was sent with a max-age of 180 days, below the one-year benchmark.

   Why it matters: HSTS tells browsers to use HTTPS for your host on every later visit, which removes the window where a first HTTP request can be intercepted.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   On Cloudflare: Enable HSTS under SSL/TLS > Edge Certificates > HTTP Strict Transport Security and raise max-age gradually.

   34% of Education & Online Learning peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 1 external script without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   On Next.js: Use the next/script component with an appropriate loading strategy.

   42% of Education & Online Learning peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

3. Priority 3 · Enable

   Structured data present

   Observed: The homepage had no JSON-LD structured data.

   What to do: Add JSON-LD for your organization and main content types, then test it with Google's Rich Results Test.

   41% of Education & Online Learning peers do this.

   Guide: Structured Data Basics for Website Owners

4. Priority 4 · Harden

   security.txt published

   Observed: No valid /.well-known/security.txt with a Contact field was returned.

   What to do: Publish /.well-known/security.txt with at least Contact and Expires fields, as RFC 9116 requires, and review it before it expires.

   On Cloudflare: Cloudflare Security Center can serve a security.txt file for the zone.

   5% of Education & Online Learning peers do this.

   Guide: A Practical Website Health Check for Owners

What platzi.com already does well

Practices fewer than half of Education & Online Learning peers use.

• CAA records limit who can issue certificatesCAA limits issuance to comodoca.com, digicert.com, letsencrypt.org and others.13% of peers
• Content Security Policy presentContent-Security-Policy present.25% of peers
• HTTP/3 advertisedHTTP/3 advertised.25% of peers

What we saw

Homepage checked

https://platzi.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Google Trust Services, 90-day validity, expiring 2027-01-18

CDN or edge

Cloudflare

Platform or framework

Next.js

DNS operators

Cloudflare

HSTS

max-age 180 days, includeSubDomains, preload

DMARC policy

p=quarantine

Homepage HTML

327 KB, br

Images on homepage

46 (jpg 237, svg 152, webp 125)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Education & Online Learning sites

• abcya.com83
• boddlelearning.com83
• grow.google84
• hotmart.com84
• lumni.fr84

Education & Online Learning readiness benchmark