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☁ What is cloud computing?
Cloud computing means using computing resources over the internet instead of owning every machine yourself. These resources can include servers, storage, databases, networking, software, and security services.
The simple idea You rent the capability you need, scale it when demand grows, and reduce it when demand drops. This makes experiments faster and avoids buying hardware before you know your real workload.
Common models
  • IaaS: virtual machines, disks, networks.
  • PaaS: managed runtime and deployment.
  • SaaS: complete software delivered online.
🧭 How do DNS and domains work?
DNS is the internet's address book. When someone types a domain, DNS tells the browser which IP address or service endpoint should receive the request.
Useful records
  • A / AAAA: point a domain to IPv4 or IPv6.
  • CNAME: alias one hostname to another hostname.
  • TXT: verify ownership or publish security policies.
  • MX: tell mail servers where email should go.
Why propagation feels slow DNS answers are cached by resolvers. A lower TTL can make changes update faster, but it may increase lookup traffic.
⚡ What do CDN and edge networks do?
A CDN places cached content closer to users. Instead of every request traveling back to your origin server, static assets can be served from nearby edge locations.
What gets faster Images, CSS, JavaScript, downloads, static pages, and repeated API responses can benefit from caching.
What gets safer A CDN can hide the origin, absorb traffic spikes, apply rate limits, and block suspicious requests before they hit your server.
🔐 What should beginners know about cloud security?
Cloud security starts with simple habits: use HTTPS, keep secrets out of code, give users the least permission they need, and monitor abnormal traffic.
First checklist
  • Enable HTTPS certificates.
  • Use strong passwords and MFA.
  • Restrict admin panels by IP or identity.
  • Back up data before major changes.
Good mental model Do not assume one layer is enough. Combine DNS, CDN, firewall, application authentication, monitoring, and backup strategy.
🖥 How should I think about servers, storage, and performance?
Server performance is not only about CPU. Real workloads depend on CPU single-core speed, memory, disk latency, network quality, and software design.
Quick comparison NVMe storage is much faster than traditional SATA SSD for heavy reads/writes, many small files, Docker layers, logs, builds, and database workloads.
Practical rule For web apps, choose enough memory first, then strong CPU, then fast storage, then good network. The bottleneck depends on your service.

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Cloud Knowledge Map

DNS & Domains

Learn how names become IP addresses, what records do, and why propagation matters.

CDN & Edge

Understand caching, edge nodes, origin protection, global routing, and latency.

Servers & Storage

Compare VPS, containers, NVMe, object storage, databases, backups, and reliability.

Snake Game

Guide the little cloud snake through the board, collect fruits and little treasures, and keep away from the walls and your own trail.

Score 0
Best 0
Speed 1x
Press Start, then use arrow keys or swipe the board.
Next

Tetris

Stack falling blocks, complete full rows, and keep the tower below the top of the board.

Score 0
Lines 0
Level 1
Press Start. Use arrows or the buttons to move and rotate.