You will find a lot of info at https://linux.oracle.com.
Check https://linux.oracle.com/documentation/ for the official documentation.
If you try to get experience with Linux I suggest to install it using a virtualization solution like Virtualbox. This will allow you to run Linux and your standard known OS at the same time - provided you have sufficient hardware (x86_64/8GB).
See https://www.virtualbox.org for more details.