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Primers

Introduction and orientation for every topic. Start here if you're new to a subject.

237 files across 10 domains

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Linux

Topic Tier Level Link
Advanced Bash Core L1 primer.md
Binary And Floats Specialty L1 primer.md
cgroups & Linux Namespaces Professional L2 primer.md
Cron Scheduling Core L1 primer.md
Debian & Ubuntu Ecosystem Core L1 primer.md
Disk And Storage Ops Core L1 primer.md
DNF Package Manager Core L2 primer.md
Ebpf Observability Core L3 primer.md
Environment Variables Core L1 primer.md
Inodes (alias → filesystems_storage) Core L1 primer.md
iptables & nftables Core L1 primer.md
Kernel Troubleshooting Core L3 primer.md
Linux Boot Process Core L1 primer.md
Linux Data Hoarding Professional L2 primer.md
Linux Distro Comparison Core L1 primer.md
Linux Hardening Core L2 primer.md
Linux Kernel Tuning Professional L2 primer.md
Linux Logging Core L1 primer.md
Linux Memory Management Core L1 primer.md
Linux Ops Core L0 primer.md
Linux Ops Storage Core L1 primer.md
Linux Ops systemd Core L1 primer.md
Linux Performance Tuning Core L2 primer.md
Linux Signals And Process Control Core L1 primer.md
Linux Text Processing Core L1 primer.md
Linux Users & Permissions Core L1 primer.md
LPIC / LFCS Exam Professional L2 primer.md
Mounts & Filesystems (alias) Core L1 primer.md
Package Management Core L1 primer.md
Perf Profiling Core L2 primer.md
Pipes And Redirection Core L1 primer.md
/proc Filesystem Professional L2 primer.md
Process Management Core L1 primer.md
rsync Core L1 primer.md
SSH Deep Dive Core L1 primer.md
Storage Ops Core L2 primer.md
strace Professional L1 primer.md
systemctl & journalctl Deep Dive Core L1 primer.md
Tar And Compression Core L1 primer.md
Terminal Internals Specialty L1 primer.md
Tmux And Screen Core L1 primer.md

Networking

Topic Tier Level Link
ARP Life Skills L1 primer.md
BGP EVPN / VXLAN Professional L2 primer.md
Cisco Fundamentals For Devops Core L1 primer.md
Dhcp Ipam Core L1 primer.md
DNS Deep Dive Core L1 primer.md
Dns Ops Core L2 primer.md
DNSSEC & DNS Security Professional L2 primer.md
Email Infrastructure Core L1 primer.md
Firewalls Core L1 primer.md
gRPC & Protocol Buffers Specialty L2 primer.md
Http Protocol Core L0 primer.md
Ipmi And Ipmitool Core L1 primer.md
LACP / Link Aggregation Life Skills L1 primer.md
Load Balancing Core L2 primer.md
Mellanox Switches Professional L2 primer.md
MTU Life Skills L1 primer.md
NAT Life Skills L1 primer.md
Network Automation Professional L2 primer.md
Networking Core L1 primer.md
Networking Troubleshooting Core L1 primer.md
Routing Core L1 primer.md
STP / Spanning Tree Life Skills L1 primer.md
Subnetting & IP Addressing Core L1 primer.md
Tailscale & Zero Trust Networking Specialty L2 primer.md
TCP/IP Deep Dive Professional L2 primer.md
VLANs Core L1 primer.md
Vpn Tunneling Life Skills L2 primer.md
Wireshark & Packet Analysis Specialty L2 primer.md

Datacenter & Hardware

Topic Tier Level Link
Bare Metal Provisioning Core L2 primer.md
Dell PowerEdge Specialty L1 primer.md
Firmware / BIOS / UEFI Core L1 primer.md
Power & UPS Core L1 primer.md
Redfish API Core L1 primer.md
Server Hardware Core L1 primer.md
Virtualization Life Skills L2 primer.md
VMware Professional L2 primer.md

Kubernetes

Topic Tier Level Link
Api Gateways Specialty L2 primer.md
Argo Workflows Professional L2 primer.md
cert-manager Core L1 primer.md
Cilium & eBPF Networking Professional L2 primer.md
HashiCorp Consul Professional L2 primer.md
Container Images Core L1 primer.md
CrashLoopBackOff (alias) Professional L1 primer.md
Database Operations Professional L2 primer.md
Docker / Containers Core L1 primer.md
Envoy Proxy Professional L2 primer.md
etcd Professional L1 primer.md
Istio Service Mesh Professional L2 primer.md
Kubernetes Concept Chain Core L0 primer.md
K8S Debugging Playbook Core L2 primer.md
K8s Ecosystem Professional L0 primer.md
Kubernetes Networking Professional L1 primer.md
Node Lifecycle & Maintenance Specialty L2 primer.md
K8S Ops Core L2 primer.md
K8S Pods And Scheduling Core L1 primer.md
RBAC Professional L1 primer.md
K8S Services And Ingress Core L1 primer.md
Kubernetes Storage Professional L1 primer.md
Kustomize Professional L1 primer.md
Multi-Tenancy Patterns Specialty L2 primer.md
Node Maintenance (alias → k8s_node_lifecycle) Professional L1 primer.md
OOMKilled (alias) Professional L1 primer.md
Policy Engines Specialty L2 primer.md
Progressive Delivery Core L2 primer.md
Service Mesh Specialty L3 primer.md

DevOps & Tooling

Topic Tier Level Link
AI Tools for DevOps Life Skills L1 primer.md
Ai Ml Ops Life Skills L2 primer.md
Ansible Core L1 primer.md
Ansible Deep Dive Professional L2 primer.md
ArgoCD & GitOps Core L2 primer.md
Backstage & Developer Portals Specialty L2 primer.md
Capacity Planning Specialty L2 primer.md
Career Engineering Life Skills L0 primer.md
Ceph Storage Professional L2 primer.md
Change Management Core L1 primer.md
Chaos Engineering Specialty L2 primer.md
CI/CD Core L1 primer.md
Claude Code Life Skills L1 primer.md
Compliance Automation Life Skills L2 primer.md
Containers Deep Dive Core L1 primer.md
Corporate It Fluency Life Skills L0 primer.md
Crossplane Specialty L2 primer.md
Css Fundamentals Life Skills L0 primer.md
Dagger / CI as Code Life Skills L2 primer.md
Database Internals Specialty L1 primer.md
Debugging Methodology Core L1 primer.md
Distributed Systems Fundamentals Core L2 primer.md
DORA Metrics & DevEx Professional L1 primer.md
Edge & IoT Infrastructure Life Skills L2 primer.md
Elasticsearch Life Skills L1 primer.md
Feature Flags Core L1 primer.md
FinOps Specialty L2 primer.md
Fleet Operations Core L2 primer.md
Git Core L0 primer.md
Git Advanced Professional L2 primer.md
Git Workflows & Branching Strategies Core L2 primer.md
GitHub Actions Professional L1 primer.md
GitOps Professional L1 primer.md
GraphQL Professional L2 primer.md
Helm Core L1 primer.md
Homelab Life Skills L0 primer.md
Incident Command Professional L2 primer.md
Incident Psychology Specialty L2 primer.md
Infrastructure Testing Professional L2 primer.md
Kafka Life Skills L1 primer.md
Legacy Archaeology Life Skills L1 primer.md
Load Testing Core L1 primer.md
Make And Build Systems Professional L1 primer.md
Message Queues Professional L2 primer.md
MongoDB Operations Core L1 primer.md
MySQL / MariaDB Operations Core L1 primer.md
Nginx Web Servers Core L1 primer.md
Nix / NixOS Specialty L2 primer.md
OpenTofu & Terraform Ecosystem Specialty L2 primer.md
Ops War Stories Life Skills L2 primer.md
Packer Specialty L1 primer.md
Platform Engineering Specialty L2 primer.md
PostgreSQL Operations Professional L2 primer.md
Postmortems & SLOs Specialty L2 primer.md
PowerShell Life Skills L1 primer.md
Pulumi Life Skills L2 primer.md
Python Async & Concurrency Professional L2 primer.md
Python Debugging Core L1 primer.md
Python Infra Core L1 primer.md
Python Packaging Core L2 primer.md
RabbitMQ & Message Queues Life Skills L2 primer.md
Redis Operations Specialty L2 primer.md
RHCE (EX294) Exam Core L2 primer.md
Runbook Craft Core L1 primer.md
S3-Compatible Object Storage Core L1 primer.md
Sql Fundamentals Professional L0 primer.md
SQLite Operations & Internals Life Skills L2 primer.md
Sre Practices Professional L2 primer.md
Systems Thinking Specialty L1 primer.md
Terraform Professional L1 primer.md
Terraform Deep Dive Professional L2 primer.md
Vendor Management & Escalation Core L1 primer.md
VS Code Life Skills L0 primer.md
WebAssembly for Infrastructure Life Skills L3 primer.md

CLI Tools

Topic Tier Level Link
awk Core L1 primer.md
Curl And Wget Core L1 primer.md
fd Life Skills L1 primer.md
Find Core L1 primer.md
fzf Life Skills L1 primer.md
Grep And Regex Core L1 primer.md
jq / JSON Processing Life Skills L1 primer.md
Modern CLI Tools Life Skills L0 primer.md
Modern CLI Workflows Life Skills L1 primer.md
Regex Text Wrangling Core L1 primer.md
ripgrep (rg) Life Skills L1 primer.md
sed Core L1 primer.md
xargs Core L1 primer.md
YAML, JSON & Config Formats Professional L1 primer.md

Observability

Topic Tier Level Link
Alerting Rules Professional L2 primer.md
Continuous Profiling Professional L2 primer.md
Log Pipelines Professional L2 primer.md
Monitoring Fundamentals Core L1 primer.md
Monitoring Migration Core L2 primer.md
Observability Deep Dive Professional L2 primer.md
OpenTelemetry Specialty L2 primer.md
Prometheus Deep Dive Professional L2 primer.md
SLO Tooling Professional L2 primer.md
Synthetic Monitoring Core L1 primer.md
Tracing Specialty L1 primer.md

Security

Topic Tier Level Link
Audit Logging Specialty L1 primer.md
Backup & Restore Professional L1 primer.md
Disaster Recovery Core L2 primer.md
Runtime Security with Falco Professional L2 primer.md
HashiCorp Vault Professional L2 primer.md
Incident Triage Professional L1 primer.md
Infra Forensics Specialty L2 primer.md
Ldap Identity Specialty L2 primer.md
Offensive Security Basics Specialty L1 primer.md
Open Policy Agent Professional L2 primer.md
OpSec Mistakes Specialty L1 primer.md
Secrets Management Professional L2 primer.md
Security Basics Professional L1 primer.md
Security Scanning Professional L1 primer.md
Selinux Apparmor Core L2 primer.md
Supply Chain Security Professional L2 primer.md
TLS & Certificates Ops Core L1 primer.md

Cloud

Topic Tier Level Link
AWS CloudWatch Professional L2 primer.md
AWS EC2 Core L1 primer.md
AWS ECS Professional L2 primer.md
AWS IAM Core L1 primer.md
AWS Lambda Professional L2 primer.md
AWS Networking Core L1 primer.md
AWS Route 53 Professional L2 primer.md
AWS S3 Deep Dive Core L1 primer.md
AWS Troubleshooting Core L1 primer.md
Azure Troubleshooting Life Skills L1 primer.md
Cloud Deep Dive Core L2 primer.md
Cloud Ops Basics Core L1 primer.md
GCP Troubleshooting Life Skills L1 primer.md

Miscellaneous

Topic Tier Level Link
Datacenter Life Skills L1 primer.md
mergerfs Life Skills L2 primer.md