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=== 1.Install Docker Engine on Debian ===
0 Uninstall old versions
  sudo apt-get remove docker docker-engine docker.io containerd runc
1 Install using the repository.Update the apt package index and install packages to allow apt to use a repository over HTTPS:
  sudo apt-get update
  sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
2 Add Docker’s official GPG key:
  sudo mkdir -p /etc/apt/keyrings
  curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
3 Use the following command to set up the repository:
  echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
4 Install Docker Engine
  sudo apt-get update
  sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin
5 The docker installer uses iptables for nat. Unfortunately Debian uses nftables. You can convert the entries over to nftables or just setup Debian to use the legacy iptables.
  sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
  sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
  sudo service docker start

=== 2 Test Docker===
  sudo docker run hello-world

=== 3 Check docker service status ===
  sudo systemctl status docker

And it shows this.
  ● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: e
   Active: active (running) since Thu 2022-07-14 15:24:57 UTC; 4min 48s ago
     Docs: https://docs.docker.com
 Main PID: 5632 (dockerd)
    Tasks: 10
   Memory: 37.4M
   CGroup: /system.slice/docker.service
           └─5632 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/contain