Here is the video version, if you prefer it:
There are two ways to install a package. (Shotts, 2019) One of them is from a repository:
apt-get install packageName
The other is from a file:
dpgk -i packageFileName
Hope you learned something useful!
References
Shotts, W. (2019). The Linux Command Line, Fifth Internet Edition. Retrieved from http://linuxcommand.org/tlcl.php. Pages 199-200