BSD Unix vs. Linux

[Mazen S. Alzogbi]

Hi,

I have a question that is bothering my brains. Why do people need Linux
while there are great stable UNIX based systems as FreeBSD out there?

Please don't get me wrong, I am not trying to say that Linux is not
good, it's a failure or anything in this regards. All what I am asking
is, why do I have to learn Linux? (I did for a couple of months and then
started the FreeBSD way).

I will appreciate if someone can shed a light on the differences,
commons, history, etc.

Thanks.

Cheers,

Mazen