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Foundations

The ideas everything else is built on: the cloud, APIs, and how a request crosses the internet.

12 lessons ready3 modulesabout 2.6 hours43 quiz questions
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Module 1

How the internet works

Beginner
  1. 1What is the cloud?Someone else's computers, rented by the minute: what that means and why it changed everything.
  2. 2What happens when you type google.com?Six steps from pressing Enter to seeing the page: DNS, TCP, TLS, HTTP and rendering.
  3. 3TCP vs UDPReliable and careful, or fast and light. Send packets on a shaky network and see the difference.
  4. 4SSL vs TLSThe lock behind https: what it protects, how it starts, and why SSL became TLS.
  5. 5DNS in depthRecords, resolvers, caching and TTL: why a DNS change can take an hour to reach everyone.
  6. 6HTTP and HTTPSRequests, responses, methods, headers and status codes, tried live with curl against a small shop API.
  7. 7IP addresses, subnets and CIDRWhat 10.0.0.0/16 really means: addresses in binary, network and host parts, private ranges, and splitting a network into subnets.
  8. 8What is a server?Just a computer whose job is to answer other computers. Look inside one: its CPU, memory, disk, and the programs waiting for requests.

Module 2

How apps talk

Beginner
  1. 9What is an API?How one program asks another program for something: requests, methods and status codes.
  2. 10Why use a CDN?Copies of your site close to every visitor: faster pages, and a calmer origin server.
  3. 11Load Balancer vs Reverse Proxy vs API GatewayThree things that sit in front of your servers: one shares, one shields, one steers.

Module 3

How apps are built

Intermediate
  1. 12Monolith vs MicroservicesOne big box or many small ones: break things, deploy, and scale, then compare.
✓Final examTest yourself on the whole Foundations trackQuestions drawn from every lesson, a new mix each time. Score 70% to pass. Start the exam →

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