Dual Boot with GRUB next to GNU/Linux "Debian"

[Schreck Julian]

Hello there,
I've been using Linux since 2013 in some flavours. Now, I'd like to install a
different OS, which is also (or at least more) in the "spirit" of Free
Software.
For not being ruined for some time if I don't get along with *BSD (or FreeBSD,
indeed), I need to keep my current system untouched.

Is there an automatic install -- sorry if I insult the community with that way
of thinking, I'm new :-) -- to "just" add FreeBSD to my current hard disk with
dual boot?

Kind regards,
 Julian Schreck

PS: Is there some *BSD user group or something in sothwest Germany?
--
https://omnibus.uni-freiburg.de/~sj126