Wanna know what's in a Linux Distribution? Watch this video:
The notes used in the video are available here:: https://www.ezeelinux.com/news/linux-...
A good bit of the above comes from: https://en.wikibooks.org/wiki/Linux_G...
A great place to learn more about Linux is a book called "The Linux Command Line" by William Shotts. Free download: http://linuxcommand.org/tlcl.php