Master the entire DevOps & SRE stack — learn it, drill it, ship it.
Tutorials, hands-on labs, production postmortems, and 99 free browser tools — spanning DevOps, SRE, Kubernetes, and cloud infrastructure across 82 technologies in 14 categories. Everything free, no sign-up.
No sign-up, no setup, no waiting
Everything runs in the browser or reads straight off the page. Pick a lane and start.
Drill the questions
1,800+ reviewed questions with real answers, code, and company-style tags — sorted from beginner to architect.
Work through a tutorial
39 hands-on zero-to-hero guides you follow on your own machine, from first container to production rollout.
Use the tools
99 browser tools for the daily work — validate a manifest, decode a cert, plan a subnet. Nothing leaves your machine.
Real output, not screenshots of a demo
Four of the 99 tools, showing exactly what they return. Every one runs in your browser.
99 free browser tools across 10 categories — jump straight in:
Free tools that run in your browser
Generators, decoders, linters, and calculators — nothing uploaded, no sign-up.
Kubernetes Manifest Generator
Generate production-ready Kubernetes YAML (Deployment, Service, Ingress, ConfigMap, HPA, CronJob) with dry-run lint checks and a live resource visualizer.
PromQL Query Builder
Build Prometheus queries visually — metrics, label matchers, rate windows, aggregations, quantiles — with plain-English explanations and ready-made templates.
SLA & Error Budget Calculator
Convert an availability target (99.9%, 99.99%…) into allowed downtime per day, week, month, and year, then track error-budget burn — the core SRE math.
JWT Decoder
Decode JSON Web Tokens client-side: header, payload, human-readable timestamps, expiry status, and optional HS256 signature verification.
SSL Certificate Decoder
Decode X.509 PEM certificates in your browser — subject, issuer, SANs, validity, key type, and SHA fingerprints. Nothing leaves your machine.
Dockerfile Linter
Lint a Dockerfile against hadolint-style rules with a security grade — unpinned images, missing USER, cache bloat, secrets — plus a multi-stage generator.
Everything you need to learn and build
One free platform to learn DevOps and get real work done — day to day.
Question BankCore
1,800+ reviewed questions with detailed answers, code examples, and expert tips across 67 technologies.
Production Issues
Real incident postmortems — symptom, root cause, diagnosis steps, the fix, and how to prevent it.
Use Cases
Production scenarios and implementation patterns drawn from real deployments.
Best Practices
Field-tested operational guidance: the why, the how, and the anti-pattern to avoid.
Certification Tips
CKA, CKAD, CKS, Terraform, and AWS — exam traps, shortcuts, and common mistakes.
Hands-on Tutorials39
39 zero-to-hero, step-by-step guides — Kubernetes, Docker, Terraform, Git, Linux, CI/CD, and more.
Dev ToolsNew
99 free browser tools — K8s manifest generator, PromQL builder, SLA calculator, JWT & cert decoders, and more.
Command Cheatsheets
Quick-reference command sheets for the tools you reach for every day.
Popular technologies
Deep coverage across 84 tools — here are a few of the most-searched.
Kubernetes
Terraform
Docker
AWS
Prometheus
Helm
Ansible
GitHub Actions
Argo CD
Kafka
PyTorch
LangChainExplore the full tech stack
82 technologies across 14 categories — each opens a hub with the tutorial, interview questions, use cases, production issues, and best practices.
Containers & Orchestration
7
Docker Compose
Podman
RancherIaC & Config Management
6
CloudFormation
Pulumi
Crossplane
OpenTofuCloud Platforms
4
AWS Services
Azure
GCPCI/CD
11
Jenkins
GitLab CI/CD
Harness
Tekton
FluxCD
Apache AirflowMonitoring & Observability
13
Grafana
Elasticsearch
OpenSearch
Logstash
Filebeat
Datadog
OpenTelemetry
SRE MetricsSystems & Scripting
4
Linux
Bash
Python DevOps
Java/JVM OpsDevOps Fundamentals
1
DevOps Fundamentals
Vault
SonarQube
Checkmarx
Trivy
Snyk
SSL/TLS Certs
mTLS
Istio
Consul
NGINX
Envoy
Git
GitHub
GitLab
BitbucketDatabases & Streaming
5
ZooKeeper
MongoDB
MySQL
ClickHouseArtifact Management
4Engineering Roles & Specializations
3
Forward Deployment Engineer
MLOps
AIOps
TensorFlow
Hugging Face Transformers
MLflow
Vector DatabasesHands-on tutorials
39 zero-to-hero guides — install, build, and ship, step by step.
Kubernetes: Getting Started
Install, spin up a local cluster, deploy, expose, scale, roll out, and debug — all hands-on.
Docker: Zero to Hero
From your first container to lean, secure multi-stage images and multi-service Compose stacks.
Terraform: Zero to Hero
Declare infrastructure, master state, build reusable modules, and collaborate with remote state.
Prometheus: Zero to Hero
Scrape metrics, write PromQL, record rules, alert with Alertmanager, and harden for production.
Grafana: Zero to Hero
Wire up data sources, build panels, template with variables, alert, and manage dashboards as code.
Argo CD: Zero to Hero
GitOps for Kubernetes — deploy from Git, auto-heal drift, roll back, and scale to many apps.
Ansible: Zero to Hero
Agentless automation — idempotent playbooks, templates, secrets with Vault, and reusable roles.
GitHub Actions: Zero to Hero
Build CI/CD with events, jobs, matrices, caching, secrets, environments, and secure deploys.
Helm: Zero to Hero
Package Kubernetes apps — install charts, template your own, manage values, and roll back safely.
Git: Zero to Hero
Master the three trees, branch and merge, rebase vs merge, undo anything safely, and a PR workflow that scales.
Free forever
No paywalls, no trials.
No sign-up
Nothing to create, just use it.
Reviewed content
Every answer is curated, not scraped.
Runs in your browser
Tools process data locally — nothing uploaded.
The answer is on the page. Not behind a signup.
No account, no trial, no credit card. Open a question, follow a tutorial, or run a tool — every one of them works the moment the page loads.