Ok guys I did it!
WEll it depends where u want to point to.
The right answer to this question is:
alias fer='~/hej'
Apparently the zsh adds the rest.
Now if u want to point to a directory more far away, inside the USER-account it'll work pasting the whole link, for instance:
alias fer='~/Documents/tutorials/ruby/RnR/third_course_0/projects'