One of the challenges of learning a language is understanding how to best use all the vocabulary terms that you are learning. It's one thing to learn a word, but quite another to know how to employ that word in a sentence.
I think this is one of the most challenging things for me when I am trying to learn on my own, without my tutors available. Take the word impiegare, for example. It means to employ, to engage or to use. But I'm not entirely sure how it's used in a sentence and when I turn to various resources I get conflicting answers.