Database

Phoenix Channels and PubSub for real-time bidirectional communication

Elixir processes and message passing for concurrent and parallel programming

Deploying Elixir/Phoenix applications with Mix releases, Docker, and Fly.io

Ecto patterns for database schemas, queries, changesets, and migrations in Elixir

GenServer patterns for stateful processes in Elixir OTP applications

OTP supervision tree design for building fault-tolerant Elixir applications

Phoenix LiveView patterns for building real-time, server-rendered interactive UIs

ExUnit testing patterns for Elixir and Phoenix applications