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I am fluent in English and French and I'm currently studying Japanese, since I plan on going there for my PhD.
French was very easy for me since its grammar is almost identical to Italian and about 89% of its vocabulary consists of equivalent terms. The reason they are mutually unintelligible, at least in their spoken form, is because French is phonetically richer, having been influenced by northern European languages.
I lived in Paris for about 3 months during a high school exchange program, that also definitely helped.
I mainly learned English through shitposting on 4chan.
You won't believe how shit Italians in general are with foreign languages, even young people (<25 years old). No, they don't even know English. It drives me mad, since Italian as a native language is an excellent starting point for learning other languages: complex grammar, sane spelling, yet lax rules about word placement. A friend of mine is currently studying in Spain, and learned Spanish in about one month. After 3 months he was barely distinguishable from a native speaker.