The process for mounting internal HDD using command line

I am new to BSD. I installed the latest version on m Thinkpad t480 on the SSD. The laptop has also an internal Hard Drive with some existing content which I want to keep. How do I mount the drive and access the contents from the command line? I read the manual but the guidelines were not specific enough or I just don't have enough background knowledge to make it work.

Can anyone help?
 
With which file system was the hard drive formated?
Hello, the file system type for the hard drive is btrfs. I checked it by loading ubuntu as trial install and then used the command df -Th

I am not sure how to find the file system type for unmounted drives in FreeBSD.
 
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