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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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8 of 58 lessons about Cloud, intermediate level Show all lessons

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. Encryption at rest vs encryption in transit Data can be encrypted where it is stored and while it travels. What each one protects against, where each stops, and why you need both. Intermediate 3 min read

Cloud computing

What the cloud is and how it works: service models, virtual machines, containers and serverless.

4 of 7 lessons shown

  1. How cloud computing works What sits behind a cloud service: data centres and regions, virtualisation, a meter on what you use, and security duties shared with the provider. Intermediate 3 min read
  2. Public cloud vs private cloud vs hybrid cloud Public, private and hybrid describe who a cloud is built for. What each one means, how they really differ, and how a small business can choose. Intermediate 3 min read
  3. What is a container? A container packages one application with the files it needs. How it differs from a virtual machine, why developers use containers, and what to ask about yours. Intermediate 3 min read
  4. What is serverless computing? Serverless means the cloud provider runs the servers and you pay only when your code runs. How it works, where it fits, and what to ask a developer. Intermediate 3 min read

Cloud platforms and storage

The three big platforms side by side, and the kinds of storage they sell.

2 of 6 lessons shown

  1. AWS vs Azure vs Google Cloud: what’s the difference? The three big cloud platforms rent out much the same things. What they share, the differences a small business would notice, and how the choice is made. Intermediate 3 min read
  2. Object storage vs block storage vs file storage Cloud providers sell three kinds of storage. How object, block and file storage each hold data, what each is used for and which one a job needs. Intermediate 3 min read

Websites, hosting and domains

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

1 of 9 lessons shown

  1. 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

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