Burning.. I mean.. roasting a lot of barley, corn, ect is a way to start, definitely.
Also probably pressing berries into juice isn't too difficult either, and there are some juices used in various brews.
Then its turning stuff into wort for brews, and there is a difference in difficulty in different drinks.. But.. I'm not sure if thats listed any place.
As far as I know roasting corn, barley, wheat, ect. is all the same though.