Cloud and tech concepts, explained calmly.
Cloud Explainers is for beginners who want to properly understand how modern systems work: Linux, networking, databases, Docker, Kubernetes, cybersecurity, AI agents and the cloud they all run on. Every video defines every term and proves the idea with a real demo. Each one has a page here with the commands, the real output and the diagrams.
Videos
The 7 Levels of Cybersecurity
Cybersecurity for beginners, one level at a time: passwords, multi-factor authentication, phishing, updates, encryption, least privilege, and detection. Each level stops a different kind of attack, and each one is proven with a real demo on a real machine, not just explained.
Every System Design Concept You Need, in One Diagram
The 12 building blocks behind almost every big app, explained for beginners on one diagram that grows as the app does: DNS, load balancers, stateless servers, databases and indexes, caches, replication and failover, sharding, message queues, object storage, CDNs and monitoring. Every one is run on a real machine and measured, not just drawn.
Why PostgreSQL Ignores Your Index
You added an index, but EXPLAIN ANALYZE still says Seq Scan. This beginner-friendly guide explains what an index really is, how the PostgreSQL planner decides whether to use it, and the six real reasons it skips your index, each proven on a real PostgreSQL 18.6 database with a one-million-row table, with the fix for each.
Beginner series
How every video is made
Diagrams carry it
Every concept gets a picture: a flow, a comparison, a highlighted line. The words explain what the picture shows.
Proven, not claimed
Demos run on real machines and the output you see is the real output, with the date it was measured.
Checked against the docs
Facts come from official documentation, listed under every video, and every video is reviewed for accuracy before it's published.