The Gnoseed library
Every topic, browseable by category. Chasing a goal instead? Try the guided paths.
Pick a category, dive into the quizzes
6,487 questions across 46 categories. Each category holds a set of focused quizzes you can drill independently.
Claude Certification
Prep for the Claude certification exams — the Associate track for evaluating output, workflows and governance, and the Developer track for the Messages API, model selection, cost and agents.
Kubernetes
Cluster architecture, workloads, networking, storage, config and security — plus ops and real-world scenarios.
AWS
The AWS certification path and the services underneath it — CLF-C02 fundamentals, the SAA-C03 trade-off tier where the question becomes which service at what cost, IAM for the engineer who writes and debugs the policies, and managed Kubernetes on EKS.
AI & LLMs
How models work, prompt engineering, building apps, customizing and deploying LLMs in production.
Linux
Practical DevOps Linux, performance troubleshooting, Bash & shell scripting, plus the full LPIC-1 101 & 102 exam objectives.
Interview Prep
Open-answer practice for real interviews — no multiple choice. You answer out loud, then compare against one model answer and a checklist of what a strong reply covers.
HTTP & Networking
Network fundamentals — the OSI and TCP/IP models, subnetting, DNS and firewalls — plus HTTP protocols, status codes, TLS and the nginx web server.
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.
PostgreSQL
JSONB, index strategies, EXPLAIN, MVCC and vacuum — plus the advanced tier: constraints as business rules, temporal data, write skew and capacity judgment.
Terraform
HashiCorp Terraform Associate — fundamentals through advanced state and modules.
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.
Web Performance
Core Web Vitals and the delivery layer behind them — caching, CDN cache keys, compression, responsive images and font loading.
SRE
Reliability targets and error budgets, incident management, toil and automation, DORA metrics, and resilience practices.
Service Mesh
Sidecars and ambient mode, traffic management, mTLS, resilience and mesh observability — Istio and Linkerd concepts.
JavaScript
Types, scope, closures, async and the quirks every dev should know.
Google Cloud Associate Cloud Engineer
Prep for the Associate Cloud Engineer exam, weighted to its four blueprint sections — the hierarchy that carries policy rather than payment, choosing between Compute Engine, GKE and Cloud Run, picking a database out of six, the globally scoped VPC whose subnets are regional, log routing and audit defaults, and an IAM model where the policy sits on the resource and inheritance cannot be narrowed.
Platform Engineering
Platform as a product, golden paths and self-service, control planes and multi-tenancy, platform APIs, developer portals and the metrics that prove it works.
Supply Chain Security
SBOMs and PURL, SLSA build provenance and Sigstore signing, dependency risk, EPSS and KEV prioritization, VEX, and artifact integrity.
Secrets Management
Vault auth, policies and dynamic secrets, transit encryption, Sealed Secrets, SOPS and External Secrets, cert-manager, and OIDC in CI.
Azure AI
Microsoft's AI-901 exam, which replaced AI-900 on 30 June 2026 — the six responsible AI principles and Foundry guardrails, generation parameters and deployment types, matching a workload to the right Foundry Tool, prompt versus hosted agents, Azure Speech, and Content Understanding.
Serverless & Event-Driven
The execution model behind functions — cold starts and concurrency, sync, async and poll-based triggers, CloudEvents and dead-letter handling, orchestration with Step and Durable Functions, Knative, Cloud Run and edge isolates, plus quotas and cost.
Web Security
The browser security model, XSS and CSRF, security headers, authentication, and web threat modeling.
Micro-Frontends
Frontend architecture at scale — the landscape, principles, DDD, composition, communication and modern tooling.
OpenTelemetry
Vendor-neutral telemetry — resources and semantic conventions, the API and SDK, context propagation, and the Collector with its pipelines and OTTL.
Kyverno
Kubernetes-native policy in CEL — the ValidatingPolicy family, the four controllers, the Kyverno CLI, and policy reports and exceptions.
MITRE ATT&CK
Adversary tactics and techniques, mitigations and detection strategies, threat-intel objects, and threat-informed defense.
Argo Workflows & Events
The other half of the Argo Project — container-native pipelines where every step is a Pod, template types and reusable WorkflowTemplates, artifacts and DAG fan-out, and the EventSource, EventBus and Sensor chain that fires them from outside events.
Ansible
Agentless configuration management — inventory, modules and idempotency, playbooks with handlers and Jinja2 templates, roles and collections, plus Vault, loops and privilege escalation.
Compliance as Code
Controls, evidence and exceptions; CIS Benchmarks, kube-bench and OpenSCAP; policy as a preventive gate; audit trails and access reviews; SOC 2, ISO 27001 and PCI DSS in practice.
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.
EU Cyber Resilience Act
The EU regulation for products with digital elements — scope and carve-outs, manufacturer duties and support periods, Annex I requirements, CE marking, and the 24-hour reporting clock.
Prometheus
Metrics, PromQL, exporters, alerting and observability fundamentals.
Go
Syntax, goroutines, channels, interfaces and idiomatic Go patterns.
Podman
Daemonless, rootless containers — pods, user namespaces, Buildah and Skopeo, and systemd Quadlet.
containerd
The runtime beneath Docker and Kubernetes — shims and runc, OCI specs, the CRI, snapshotters, and ctr/nerdctl.
AI & Model Security
OWASP LLM application risks, attacks on models themselves, MLSecOps provenance and AI-BOM, AI in the SDLC, and NIST AI RMF, ISO 42001 and the EU AI Act.
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.
etcd
The distributed key-value store behind Kubernetes — MVCC, leases, Raft consensus, quorum, backup/DR and the K8s datastore.
Cilium
eBPF-powered Kubernetes networking, security and observability — identity-based policy, L7/DNS rules, Hubble and kube-proxy replacement.
Secure Coding
Authentication, access control, input validation, crypto and safe logging — app-security fundamentals.
Falco
CNCF runtime security for Kubernetes — syscall/eBPF detection, the rules language, threat scenarios and the falcosidekick ecosystem.
OPA / Gatekeeper
CNCF policy-as-code — the OPA engine and Rego, Gatekeeper constraints and admission control, plus OPA beyond Kubernetes.