Hosting
Edge platforms (Vercel, Cloudflare), app platforms (Railway, Fly.io), and cloud providers (AWS, GCP, Azure). When to pick each.
DevOps
Containers (Docker), orchestration (Kubernetes), infrastructure as code (Terraform), secret management. The plumbing underneath hosting.
Observability Tools
The tooling for errors (Sentry), logs (Datadog, Axiom), metrics (Prometheus), traces (Honeycomb), and product analytics (PostHog).