Internet Fundamentals
How the internet actually works: DNS, HTTP, hosting, and browsers.
What's Inside
6 items
- 018 mins
How does the internet work?
Networks of networks; clients and servers.
- 029 mins
What is HTTP?
Requests, responses, methods, status codes, headers, and HTTPS.
- 037 mins
What is Domain Name?
Domain names, URLs, TLDs, subdomains, registrars, and how domains relate to hosting and DNS.
- 046 mins
What is hosting?
Hosting websites and apps, static vs dynamic hosting, CDNs, deployment, and custom domains.
- 059 mins
DNS and how it works?
DNS resolvers, nameservers, records, caching, TTL, propagation, and connecting domains to hosting.
- 067 mins
What do browsers do?
How browsers fetch resources, render pages, run JavaScript, store site data, and expose DevTools.
What you'll learn
- Explain how data travels between clients and servers using IPs, packets, ports, and shared protocols
- Read and write HTTP requests and responses, including methods, status codes, headers, and HTTPS
- Understand how domain names, registrars, hosting, and DNS fit together to make a website reachable
- Reason about DNS records (A, CNAME, MX, TXT), caching, TTL, and propagation
- Describe what a browser does end-to-end: fetch resources, render HTML and CSS, run JavaScript, and inspect with DevTools
Meet the Author
The people behind this pack
Kamran is the founder of roadmap.sh and works on it full-time. Over the past decade he's shipped across startups and scale-ups, with most of his work in open source, he's a Google Developer Expert, a GitHub Star, and the second-most-starred developer on GitHub globally.
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