Using CentOS 7 image in Docker

This is my first time with Docker so as usually I am having a few doubts. I am running Windows 10 x64 as a host with all virtualization flags enabled and I have installed Docker. I am reading and following the guide at this link but I want to do using CentOS instead of the image them use as example for which I found the CentOS image and get this, all right but what is the next command I should run: docker pull centos or something like docker run docker/whalesay cowsay boo (which by the way I don’t know the proper one for CentOS)? Any advice on this?

If you want to use Centos, “docker pull centos” is the command you need to “download” Centos OS into your computer.

Great, thanks I used another command docker run -it centos but the one you gave me should works too