Red Hat

I am being asked to use RHEL red hat instead of ubuntu. Are the basic commands the same? I know the licensing is different, but are the package mangers/repositories the same?
That is will sudo apt-get still be used? I have been using ubuntu for 4 years and have never used red hat so any information will help. Thank you .

The concept of repos or repositories and the use of a software manager to install, delete and update packages is similar. The software to manage packages in RHEL is yum and its functionality is similar to apt-get. RHEL uses a rpm base format for its packages.
In RHEL you need a paid subscription to access the Red Hat official repository to get update it.
The end of life for a RHEL distribution starting at RHEL 6 release is 10 years.
A subscription free distribution that aims to be 100 percent binary-compatible to RHEL is CentOS.

Not quite sure about RHEL7, but since Fedora 20 there is dnf available, and since 21, one must use dnf as yum no longer works.

The repo of ubuntu has quite more packages that any switcher (eg: win->linux) might be looking for, such as skype, mp3 codecs and similar things.
Such applications will be harder to get for RHEL, but once the repo is installed, it will be like ubuntu.

hth

RHEL7 still uses yum and since it is supported until 2024, yum is still relevant.

RHEL8 will use DNF

I'm not sure, but I thought that you had to pay for a Redhat license if you want to use Redhat. Perhaps that is only if you want to use it for commercial purposes. If you are, then you should probably look into that. There are two other versions of Linux that would work as well. Centos is essentially a free clone of Redhat. You don't get the same support that you would get if you had a Redhat license, but it is essentially the same. There is also Scientific Linux, which is sponsored for the Fermi National Accelerator Lab.

https://www.scientificlinux.org/

Scientific Linux does have some differences in libraries, but it should work the same. Generally Redhat and Redhat clones use YUM for maintaining packages. I have Ubuntu at home. I have Oracle 11.2.0.2 installed and running, as well as mySQL, and a test version of Request Tracker that I am testing. It works fine for what I need. It just has more user friendly packages along with things that you would need for databases or web servers.