What’s inside

Linux

Commands, file system, users, SSH, networking, LVM, SELinux, systemd, boot process — 30+ pages of hands-on notes.

Networking

OSI model, TCP/IP, DNS, DHCP, NAT, VPN, subnetting and traffic analysis from scratch.

Docker & Kubernetes

Container internals, images, Compose, K8s architecture, pods, services, deployments, YAML configs.

AWS

IAM, VPC, subnetting, NAT Gateway, Transit Gateway, CloudFormation basics.

Terraform & CI/CD

Infrastructure as code, AWS provider, remote state. Jenkins, GitHub Actions, SonarQube, deployment patterns.

Scripting

Bash, Python (Flask, OOP, modules), PowerShell — real automation, not toy examples.

Git & Monitoring

Branching strategies, merge vs rebase, interview prep. Prometheus, alerting, SRE fundamentals.

More

Windows Server, MS SQL, Hypervisors, interview Q&A — the stuff everyone needs but nobody documents well.