You just setup with the traditional partitioning scheme, so / and /home on separate partitions. You can have as many / partitions as you like with different distros on sharing the same /home partition. You still need to install all the packages you use in each distro, but your setup, personal and config file are consistent and preserved across all the distros.
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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