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Linux File Permissions — Read, Write, Execute Without Tears
A clear walkthrough of Linux file permissions. Read the funny rwx- letters, change them safely with chmod, fix "permission denied" errors with confidence.
Kubernetes 101 — Pods, Deployments, and Services Explained
Run your first three Kubernetes objects — Pod, Deployment, Service — on a local cluster, then understand why each one exists and how they fit together.
GitOps Explained — What It Is and Why Teams Adopt It
GitOps in plain words — what it actually is, the workflow it enables, and a hands-on demo using Argo CD on a local Kubernetes cluster.
Your First CI/CD Pipeline with GitHub Actions
Walk through a working GitHub Actions workflow — install, test, build, deploy — for a tiny Node app. Every line explained.
Docker for Beginners — Build, Run, and Ship Your First Container
Walk through your first Dockerfile, container run, and image push in 30 minutes. No theory dumps — just the commands and what each one is doing.
Build Your First RAG App in 100 Lines of Python
A working retrieval-augmented generation app you can run today. Markdown ingestion, embeddings, semantic search, and an LLM answer — start to finish in one afternoon.
Bash Scripting Tutorial — Write Your First Useful Script
Build a real disk-cleanup script step by step. Learn variables, conditionals, loops, error handling, and the safety preamble that prevents foot-guns.
AWS VPC Explained — Subnets, Route Tables, and the Internet Gateway
A working mental model for AWS VPCs — what each piece does, how they connect, and why "VPC" is the wrong mental model if you came from physical networks.
AWS S3 Tutorial — Buckets, Permissions, and Common Pitfalls
Create your first S3 bucket, upload and download files, and set up the right access controls — without accidentally making everything public.
AWS Lambda — Deploy Your First Serverless Function
Write, package, and deploy a Lambda function using only the AWS CLI. Trigger it via a public URL. Understand what serverless actually means.
Ansible Tutorial — Configure a Server in 30 Minutes
Install Ansible, write your first playbook, and configure a remote server (nginx + a deploy user) without touching it manually. The basics that scale up.
Feature Flags in Production — Provider Choice and Operational Reality
We use feature flags on roughly every customer-facing change. The provider tradeoff, the patterns that hold up, and the failure modes that show up only after a couple of years.