Docker

Images vs containers

Dockerfile basics

Building and tagging images

Running and inspecting containers

Logs and exec basics

Volumes basics

Bind mounts basics

Data persistence strategy

Backup/restore overview

Permissions pitfalls

Bridge networks basics

Exposing ports

Service discovery in compose

Reverse proxy overview

Debugging network issues

Multi-service stacks

Env vars and secrets overview

Healthchecks overview

Build vs image usage

Profiles overview

Registry basics

Multi-stage builds overview

Security basics (least privilege)

Resource limits overview

Deployment checklist overview