I can't figure out how to brew any potion, and the tutorial sucks. The potion always gets spoiled whenever I'm trying to heat up the cauldron. I also bricked my first couple of save files by throwing all my herbs onto the fire rather then the cauldron because I didn't know that mattered.
Edit: And now restarting a new game from the beginning a fourth time after bricking my save file, the guy who shows up to give free herbs is no longer showing up. So now I couldn't even play the game even if I knew how.