The Gnoseed library
Every topic, browseable by category. Chasing a goal instead? Try the guided paths.
Pick a category, dive into the quizzes
3,019 questions across 24 categories. Each category holds a set of focused quizzes you can drill independently.
Kubernetes
Cluster architecture, workloads, networking, storage, config and security — plus ops and real-world scenarios.
AI & LLMs
How models work, prompt engineering, building apps, customizing and deploying LLMs in production.
Linux
Practical DevOps Linux, Bash & shell scripting, plus the full LPIC-1 101 & 102 exam objectives.
Git & GitHub
Version control with Git and collaboration on GitHub — branching, merging, remotes, pull requests, GitHub Actions, and repository governance.
DevSecOps
Shift-left culture, the software factory and CI/CD, containers and service mesh, zero trust, and cATO governance.
Terraform
HashiCorp Terraform Associate — fundamentals through advanced state and modules.
HTTP & Networking
Protocols, status codes, headers, TLS and the request lifecycle — plus the nginx web server and reverse proxy.
AWS Cloud Practitioner
Cloud fundamentals for the CLF-C02 exam — cloud concepts and economics, the shared responsibility model and IAM, core compute, storage, networking and database services, global infrastructure, and billing, pricing and support.
Micro-Frontends
Frontend architecture at scale — the landscape, principles, DDD, composition, communication and modern tooling.
GitOps
Continuous delivery the GitOps way — the OpenGitOps principles, Argo CD and the Application model, repo patterns and sync strategies, and the Flux toolkit for multi-cluster.
Ansible
Agentless configuration management — inventory, modules and idempotency, playbooks with handlers and Jinja2 templates, roles and collections, plus Vault, loops and privilege escalation.
Helm
Charts, templating, releases, values and the Helm package workflow.
Python
Types and data structures, control flow, functions, OOP and the gotchas every Pythonista should know.
SQL
Queries, joins, aggregation, window functions, data modeling and transactions — standard SQL for every engine.
PostgreSQL
JSONB, index strategies, EXPLAIN, MVCC and vacuum, and the day-two operations of the world’s favorite open-source database.
Service Mesh
Sidecars and ambient mode, traffic management, mTLS, resilience and mesh observability — Istio and Linkerd concepts.
Podman
Daemonless, rootless containers — pods, user namespaces, Buildah and Skopeo, and systemd Quadlet.
Prometheus
Metrics, PromQL, exporters, alerting and observability fundamentals.
Go
Syntax, goroutines, channels, interfaces and idiomatic Go patterns.
Docker
Images, layers, Dockerfiles, volumes, networks and container basics.
Observability
The three signals and RED/USE, structured logging and Loki, distributed tracing with spans and sampling, OpenTelemetry, and Grafana.
Secure Coding
Authentication, access control, input validation, crypto and safe logging — app-security fundamentals.
SRE
Reliability targets and error budgets, incident management, toil and automation, DORA metrics, and resilience practices.
JavaScript
Types, scope, closures, async and the quirks every dev should know.