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English is the default.
Guided learning path

Technology fundamentals

Learn the normal system before its security failures.

16 lessons · Approximately 98 minutes · Learn at your pace

Before you start: No prior lessons required.

  1. From Your Browser to a WebsiteMeet clients, servers and networks before learning how they are secured.7 minLesson
  2. How DNS WorksFollow a domain name through a resolver, the DNS hierarchy and a cached answer.6 minLesson
  3. HTTP and HTTPS ExplainedWatch a browser send a request and receive a response, then place that exchange inside a protected channel.6 minLesson
  4. How TLS WorksSee how a client checks server identity and establishes keys for an encrypted connection.6 minLesson
  5. Databases, Records and SQL Before InjectionUnderstand tables, queries and transactions before studying database attacks.7 minLesson
  6. HTTP Status CodesRead the server’s response as a useful signal, without mistaking a status code for the whole story.6 minLesson
  7. How APIs WorkFollow a client request through a service contract to data and back to a response.6 minLesson
  8. Cookies and SessionsSee how an HTTP cookie can connect separate requests to server-side session state.6 minLesson
  9. API Gateway ExplainedInspect the gateway’s routing and shared controls, then see which decisions still belong to the application.6 minLesson
  10. How Caching WorksCompare a cache hit with a miss, and see why freshness and cache keys are security decisions too.6 minLesson
  11. How Message Queues WorkFollow a job from producer to consumer, then explore acknowledgement, retry and duplicate processing.6 minLesson
  12. Is My Saved Page Still Current?Follow a browser checking a saved response before downloading it again.6 minLesson
  13. A Transfer Should Finish TogetherUse a fictional points transfer to understand committing and rolling back related changes.6 minLesson
  14. Encryption: A Locked Letter and Its KeyUnderstand how readable data becomes protected data and why the key matters.6 minLesson
  15. Hashes: A Fingerprint for DataLearn how a digest helps compare files and why a checksum needs a trusted reference.6 minLesson
  16. Digital Signatures: Who Signed These Bytes?Distinguish verifying a signature from hiding information or proving it is harmless.6 minLesson

Bring it together

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