For example, a Spanish person will obviously have a much easier time learning Italian, compared to a Chinese person for example.
In general it's said that it is comparable easy to learn similar languages to the ones one knows already. In my own case, however, I noticed that I forgot nearly all my French since I started to learn Spanish! Because words often are so similar I always only remember Spanish words in case I try to speak French ... Actually, to be exact, I still understand French rather well, but just cannot speak it at all anymore (for example if anybody asks me in French to explain him the way, I am completely lost ... so annoying ...). :)
By the way, as you are still new, I suggest you to check the blog from from time to time. He opens his bar every Sunday, so that new Steemians can learn to know each other ... It is comparable to "Bei Hilde" in Politopia.
RE: What’s the most difficult language in the world?