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Originally Posted by
mindful123
It seems to me that you can download and burn the installation files to CD.
This is usually an option, yes.
You can also download images for things called livecd's, which boot a complete UNIX system from CDROM without having to install anything on your hard drive. They don't save changes across reboot, of course -- the CD image can't be changed once burned -- but they can be a relatively safe way to introduce yourself to a system. They're also handy rescue disks.
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Just wondering whether you can install BSD in external hard drive, so I don't need to install another internal hard drive for specific to Unix system running.
This depends a lot on the computer. Some do a good job of booting from USB, some don't.
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Is there installation instruction after downloading it to the hard drive?
Probably, but which instructions you need really depend which distro you pick. UNIX is alike in the sense that it provides a similar environment when installed, not that it's installed or managed the same way across the board. Installation and management actually vary quite a lot across different UNIX varieties.