Which platform should I download for FreeBSD?

[Jason Lindsey]

I hope you help me, 

I own a iMac 64, and do not know if I should download amd64 or arm64 platforms to support FreeBSD.  I would appreciate an answer to my question ASAP, in that I currently learning Solaris 10 and other versions of BSD software.  I would like to include FreeBSD in my studies.

Sincerely and Thank you,

Jason H Lindsey
Two Owls Working Associates
Jason.H.Lindsey at twoowlsworkingassociates.com