|Yes you can install almost any number of OS's.|
There are many ways to do it and plenty of web pages dedicated to that.
I suggest that you do a full ntbackup with system state to some remote media before you attempt this.
I think I'd first look at using a virtual machine. Your laptop may be a bit too slow but see if it supports virtual machines. They are the most easy safe way to learn OS's.
People used to use partition/boot managers. Now most new OS;s can be used to dual boot. Either stick with MS's loader or you will have to learn at least a bit of grub. OS's like solaris need grub while others may be used with lilo or versions of syslinux.
Playing to the angels
Les Paul (1915-2009)