en could be an adverbe: origine, where something is from!
Il en vient. he comes from. --> from there
"en" could be a preposition: it could indicate the place, the situation, the manner/way, the transformation, the duration. -->in, to, from, by, on, at, of, while
ex: She transforms the frog INTO prince. Elle transforme la grenouille EN prince.
it could be a "Pronom personnel": --> it
"Tu n'en sais rien"
i hope it could hep you! sorry if i am not clear!