Installing Dockers & IRIS image

Hi Guys,

I'm a newbie in Dockers & containers and trying to install IRIS & VS Code in a container with dockers in Linux.

My understanding is that I first need to install docker, create a container then install IRIS image and looked into this documentation (Container How-to | InterSystems IRIS Data Platform 2024.2) and got me lost so I guess I need baby steps:

So I've installed Ubuntu in my Desktop and went to https://containers.intersystems.com/contents (as below) to download IRIS image but I found commands, so I tried running one of those commands in Linux thinking that it will install docker, create a container and install the IRIS image but I was wrong:

So maybe I need to install Docker then create container in Ubuntu before running this command to install IRIS image, but I also was unable to install a docker!?

Could you pls take me through the steps on how to install the docker, create a container and install the IRIS image? 

Thanks