new user : simple playbook help

yml

---
- include: service_default_packages.yml
- hosts: all
  tasks:
    - name: "install default packages after minimal install"
      apt:
        name: "{{ item }}"
        state: present
      loop:
        - "at"
        - "attr"
        - "auditd"
        - "bc"
        - "binutils"
        - "cal"
        - "cpio"
        - "curl"
        - "dnsutils"
        - "fail2ban"
        - "file"
        - "gzip"
        - "ipset"
        - "ltrace"
        - "mosh"
        - "netcat"
        - "ntp"
        - "ntpdate"
        - "ntpstat"
        - "pdns-recursor"
      when: ( ansible_distribution == "Debian" ) and ( ansible_distribution_major_version == "9" )