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Gigi!!! this is not a spoiler so don't worry, in Final Fantasy IX they explain a little too late that you should always STEAL from enemies if you have the command "STEAL" available, also all enemies carry atleast 2 items (instead of just 1 like other Final Fantasy games) a "normal item" and a "rare item"
I'm telling you this because you should always Steal both items from unique enemies in fights like bosses, named characters, one time fights. you will not regret it and will get amazing stuff.
Sorry if it sounds like backseating, but the game really doesn't explain this soon enough and you will miss great stuff