It sounds easy but I can't fix it: I want to permanently disable automatic spell-checking in emacs. There must be a simple line for my init.el. Can somebody help me?
Figure out why it's on in the first place (it isn't enabled by default), then fix that. Either your init file is turning it on, or else some system-wide init file is. Read about those files: http://www.gnu.org/software/emacs/manual/html_node/emacs/Init-File.html