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Short lessons that explain one thing properly. Search for a word, or pick a subject and read it through from the basics.

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15 of 58 lessons about Websites Show all lessons

Cyber security fundamentals

How attacks work, in plain words: ransomware, phishing, malware and the flaws they use.

1 of 8 lessons shown

  1. What is a DDoS attack? A DDoS attack floods a website or online service from many devices at once until real users cannot get through. How it works and how to prepare. Beginner 3 min read

Data security and encryption

How data is kept unreadable to anyone who should not see it: encryption, certificates, TLS and hashing.

1 of 8 lessons shown

  1. What is a digital certificate? A digital certificate ties a public key to a name, and a trusted authority signs it. What is inside one, who vouches for it, and why it expires. Intermediate 3 min read

Websites, hosting and domains

What happens between typing an address and seeing a page: domains, DNS, hosting, HTTPS and CDNs.

9 lessons

  1. How does a website work? What happens between typing a web address and seeing the page: the browser, the name lookup, the server and the files it sends back. Beginner 3 min read
  2. What is a domain name? A domain name is the readable address of your website and email. How names are built, who may hold a .au name, and why renewal matters. Beginner 3 min read
  3. What DNS is, and why your business depends on it DNS turns your domain name into the addresses that run your website and email. What the records mean, and how to change them safely. Intermediate 2 min read
  4. What is web hosting? Web hosting is the service that keeps your website on a server and delivers it to visitors. The main kinds, and what to ask a host. Beginner 3 min read
  5. Domain name vs web hosting: what’s the difference? The domain name is the address and the hosting is where the website lives. Why they are separate, and why the business should hold both logins. Intermediate 3 min read
  6. What is HTTPS? HTTPS is the encrypted way a browser talks to a website. What it protects for your visitors, what it does not, and how to turn it on. Beginner 3 min read
  7. HTTP vs HTTPS: what’s the difference? HTTP sends web pages in the open and HTTPS sends them encrypted. What visitors see in the browser, and what moving a site to HTTPS involves. Intermediate 3 min read
  8. What is an SSL certificate? An SSL certificate proves a website belongs to its domain name and lets browsers encrypt the connection. Who issues one, and why it expires. Beginner 2 min read
  9. What is a content delivery network (CDN)? A CDN keeps copies of your website on servers in many places, so each visitor is served from one nearby. What it speeds up and what it cannot. Intermediate 3 min read

Search and website performance

Being found and being fast: how search engines read a site, caching and Core Web Vitals.

4 lessons

  1. What is search engine optimisation (SEO)? SEO helps search engines understand your website and helps people find it. How Google finds and ranks pages, and what SEO cannot promise. Beginner 3 min read
  2. What is technical SEO? Technical SEO is the part that makes sure search engines can reach, read and store your pages. What robots.txt, sitemaps and canonical addresses do. Intermediate 3 min read
  3. Core Web Vitals, explained Three measurements Google uses to judge how a page feels to use: how fast it loads, how quickly it responds and how steady it is. Intermediate 2 min read
  4. What is website caching? A cache keeps a copy of your web pages so they load faster. Where the copies live, why an edit sometimes does not show, and how to clear them. Beginner 3 min read

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