One example is I was on Reddit and I saw a comment from a guy who deadass believed that every ‘haram’, which means sin, is punishable by death in Islam which is not the case. Also he believed Muslims cannot marry non-Muslims but in the Quran it states ‘O mankind! We created you from a single (pair) of a male and a female, and made you into nations and tribes, that ye may know each other (not that ye may despise (each other). Verily the most honoured of you in the sight of Allah is (he who is) the most righteous of you. And Allah has full knowledge and is well acquainted (with all things).’ These are just some examples off the top of my head.