Openstack Neutron is the networking service. It is similar to AWS VPC or Azure VNET.
Glance is image service of OpenStack. It’s similar to AWS AMI and Azure VM Images.
Openstack Nova is the equivalent of AWS EC2 instances or Azure VMs.
Red Hat Certified System Administrator in Red Hat OpenStack exam tests the Openstack management skills of candidate. Before you start preparing for this exam you should understand basic Linux. Redhat recommends skills of at least the level of RHCSA-RHEL. And this level is important as it’s a lab exam and you have to answer the questions by doing them practically.
Here I am listing few commands and topic which should get you started for the basic required Linux level.
Most of the services provided by different cloud providers are same as what you do in on-premises setup, they just have a different name in cloud. Below is comparison of major services offered by different cloud providers and what they mean in simple laymen terms. Hope this is helpful to you.