I was told by a native speaker that the "diverse aspects" part in the sentence below, would be better to change, but he couldn't come up with alternative words when we spoke.
Does anyone have any idea??

Learning about diverse aspects of the world by diving into why humans are fighting, and analysing the root causes of conflicts with students from different nationalities and backgrounds, are essential to truly understand these things (cultures, religions, political systems, and so on).

See a translation

I commented on at least one other post of yours today, and I would say based on the questions you are asking and that your writing is very close to what most American students will get to University with, and from what I've read of your writing samples I would assume you had near native proficiency based on your choice of words, If the rest of your essay is this clean or if you are writing this well without many corrections, I would suggest you actually start using resources intended to help native English speaking college students improve their essays. There are many strategies and tips for native English speakers to elevate their writing since many native speakers won't be used to or very skilled at writing in a formal way.

(And obviously keep posting for corrections so we can all help more).

Let me know if that makes sense and is helpful.