Qual è la differenza tra dedicated e enthusiastic ?Sentiti libero di rispondere con un esempio.

Enthusiasm is similar to excitement. Being enthusiastic about improving your French skills would mean that you're happy you can improve your French skills and can't wait to start.
Dedicated refers to sort of a sense of responsibility, although not exactly. To be dedicated to improving your French skills means that you won't give you, and that you're fully committed to it. (I guess it's a similar word to "devoted")

Both of these can result in a person putting a lot of effort into improving their French skills - the difference being that if they're enthusiastic, it's something they enjoy, and if they're dedicated, they might not enjoy it but they'll work hard anyway.