Best practices for writing docker-compose files

docker-compose.yaml

version: "3"  # specify compose spec version

services:
  db:  # define a service name (docker-compose restart db)
    image: postgres:13  # specify an image tag
    container_name: db  # define a container name (docker logs -f db)
    restart: unless-stopped  # specify an appropiate restart policy
    volumes:
      - psql_data:/var/lib/postgresql  # use named volumes
    healthcheck:
      test: "[ -S /var/run/postgresql/.s.PGSQL.5432 ]"
      interval: 20s
      timeout: 5s
      retries: 3
      start_period: 10s
    networks:
      - internal

  backend:
    build: . # build image instead of pulling
    container_name: backend
    restart: unless-stopped
    networks:
      - internal
    depends_on:
      - db

  frontend:
    build:  # long syntax for building an image
      context: /opt/frontend
      dockerfile: Dockerfile
    container_name: frontend
    restart: unless_stopped
    command : npm start
    networks:
      - internal
    depends_on:
      - backend

  proxy:
    image: nginx:stable
    container_name: proxy
    restart: always
    ports:
      - 80:80
      - 443:443
    volumes:
      - nginx_config:/etc/nginx/conf.d
    networks:
      - internal
    depends_on:
      - frontend

networks:
  internal:
    driver: bridge

volumes:
  postgres_data:  # long syntax for named volumes
    driver: local
    driver_opts:
      type: "none"
      o: "bind"
      device: "/data/postgresql"
  nginx_config:
    driver: local
    driver_opts:
      type: "none"
      o: "bind"
      device: "/opt/nginx/conf.d"