1.CentOS 7 minimal install on Oracle VM VirtualBox 6.0

The CentOS is a community-driven free software effort focused on delivering a robust open source ecosystem around a Linux platform.

CentOS download disk image:
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https://www.centos.org/download/

Difference between redhat and centos:
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Centos vs RedHat: 15 Interesting Facts to Know

putty download
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https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

Oracle VirtualBox download:
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https://www.virtualbox.org/wiki/Downloads

source

centos 7