"The people of China is a huge group."
Translation:La popolo de Ĉinio estas grandega grupo.
When people means “the entire body of persons who constitute a community or other group by virtue of a common culture, history, etc.,” it is used as a singular, with the plural peoples: This people shares characteristics with certain inhabitants of central Asia. The aboriginal peoples of the Western Hemisphere speak many different languages.
Simple. de is a sorta possessive word. El indicates a direction away or out of. f.e. La filinoj de irlando would be a woman's group, the Daughters of Ireland. But if you change that one word it becomes La filinoj el irlando and now is "The daughters from Ireland," a group of youngish female emigres. Or, again, La libro de la instruisto. is a book belonging to a teacher, but La libro el la instruisto. would be, I'd hope, a book written by that teacher.
Coming out of him physically sounds a bit messy and painful, it would definitely be an alien book.
I get that, but it's really confusing to decide what preposition to use when refering to countries since we usually say "Mi estas el..." , but also I have seen the preposition "de" used for sentences related to countries, like: "De kie vi venas?" when it should be "El kie vi venas?".
What I am trying to say is that I thought we should always use "el" when talking about countries.
Not always. I'm going to quote from "Being Colloquial in Esperanto" by David K. Jordan (great book, you should try to get a copy.) It shows me that I had things confused myself in my last post:
de = by, of, from. In general this preposition is used to show a relationship between two nouns whereby the first depends on or "belongs to" the second.
la patro de Roberto = Robert's father
la letero de la hungarino = the Hungarian woman's letter
la leciono de Esperanto = The Esperanto lesson.
Notice the contrast between de and el:
Mi venas de Francio = I come from France (i.e. I'm French)
Mi venas el Francio = I am coming from France (i.e. I have been to France)
De kiu planedo vi venas? = What planet do you come from?
With another preposition, indicating a place, de (or el) shows motion away from the place:
Li prenis ĝin de sub la lito = He took it from under the bed.
Caution: English "of" is not necessarily translated by Esperanto de (etc.)
And, a few pages later we read:
el = from, made from. see also de.
Li revenis el la domo = He came back out of the house, again
Mi venos el Peru = I will be coming from Peru
la kaliko estas el rusa vitro = the goblet is made of Russian glass
ni manĝis kompoton el prunoj = We ate a plum compote.
Oni elektis lin, el inter 500 viroj, kiel la plej belan. = They picked him out of 500 men as the best looking.
Fine, timeme, ŝi venis el sub la sofo. = Finally, timidly, she came out from under the sofa.
I left out bits which were not part of the discussion, but I think that you can see a pattern developing here.
I do hope that this helps you, and any others who may read this later having your selfsame question.