You may find this video helpful.
www.youtube.com/watch?v=lQn84dgRC8E
One point that I can add to the previous comments is that although both languages share the same alphabet, they are pronounced completely differently. For a Persian speaker (Farsi is an Arabic name for Parsi or Persian) there is no difference between the pronunciation of the letters "ث" and "ص" and "س" all of which sound like "se" in Persian. However, these letters are pronounced differently when an Arabic speaker is pronouncing them. You can find videos about this on Youtube.
Just an off-topic comment:
<ul class="list-inline text-light-gray no-margin-b"><li><a ui-sref="user({id:comment.commenter_obj.id})" href="https://www.italki.com/user/4298986" style="outline: 0px; outline-offset: -2px; color: rgb(0, 0, 255);">Germán Vogel</a>, after reading your comment, I happened to look at your profile and found you have quite a good traveling experience around the world. Now, what drew my attention and made me confused was your listed countries where you have said, "I don't believe in." May I ask what do you exactly mean by "believe in"? Do you dislike or something else? </li><li></li><li>And lastly, the way you wrote them will certainly make others confused and may give them wrong information. For example, you said, "</li></ul>⛔️ Pakistan, Bangladesh — are actually India ✅" If you will write like this, then someone who has no geographic knowledge may thing Pakistan and Bangladesh are in India but the fact is, they both are two different countries!
So, whenever you are mentioning something, put some clarity on it!
It will be much easier than it would be for you because they share an alphabet system (with a couple of extra letters in Farsi, such as the P sound پ), they share approximately a similar mentality/culture/history and thousands of words. That said, the grammar can be pretty different, even more than the difference between Romance and Germanic languages, Arabic being the more challenging one (just consider it has gender distinctions as Spanish, and also 14 personal pronouns with their own conjugations!)
From personal experience and observation of many cases, Arabic natives learn Farsi about twice or three times faster than people native in a Western language, and vice versa, although I have observed it can be more challenging for Persian speakers to learn Arabic than the other way around.
They share mostly the same alphabet, but they're not in the same language family. Farsi is an Indo-European language, whereas Arabic is a Semitic language. Arabic is actually much closer to Hebrew, which is a Semitic language as well.
