no riddle, it is an instruction
cp ~/bigfile /misc/big\ file2
cp = copy command
~/ = short for $HOME/ , which is 'short' for /home/<user>/ ,, or whatever is stated in the /etc/passwd file for home dir of the user
/misc/ is your target dir, big\ file2 is target filename
the \ , 'escapes' the space, spaces are 'special'
another way to 'protect' the space would be
cp ~/bigfile "/misc/big file2"
but your description is full of holes, I do not believe your ls output
and you may run into permission issues if /misc is not owned by the user
read manuals for cp and ls
use the ls to display more 'info' ( details are in the manual )