What's next in jobs?

Well, I can read that as two ways:
"Beginners, or Alchemists, who only know of experimenting." (This would mean what you said, that alchemists can't fight.)
or
"Beginners, or Alchemists who only know of experimenting." (This would mean that they're only dangerous to Alchemists who only know how to experiment, and implies that there are alchemists who can do more than that.)

Just trying to save the fun of Alchemist job. XD

You win. Both are possible, even in the Korean version of the text.