Does Italian and French have any similarities in their languages?
(not meant to offend anyone)
They're both Romance languages (languages that have developed from Latin), so there are a lot of similarities in grammar and vocabulary.
They have a lot of words that are at least pretty similar, but most of the pronunciation will be different.
Italian is the most similar language to French out of the courses offered on Duo. If you know one, you will find that a lot of words - probably around 2/3 or more - are so similar you can guess the meaning. French grammar, though, is different in quite a few ways from Italian and other Romance languages. For that reason, French is a bit of an oddball. That being said, if you know one, the other won't be totally strange. Italian felt familiar when I started the tree after studying French for a few years.
While they have similarities, they are different languages. If they were close enough, they would be different accents of the same language (ex. English, American English, Australian). As TheEeveeLord says, they developed from the same root and have some similarities, but they grew differently!