Questions :4 With the chief features of the Harappan civilization, answer the following:
a) Any three characteristics features of town planning (3)
b) Three special features of the houses of the people (3)
c) Mention any two common elements between Mohenjodaro and Harappan (4)

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ah, so ustedes and nosotros are my 'go-to' if i am using spanish mainly in the states? interesting, but still slightly confusing, haha."

it seems that you are a little confused about subject pronouns. yo=i, tú/usted=you, nosotros=we, ustedes=you(plural), ellos/ellas=they.

in the case of vosotros, it is an informal replacement for "ustedes" in spain. similar to using "you all" in english.

even though it is not generally used in conversation outside of spain, it is used many times in literature. i would suggest having at least some familiarity to that form, at least to recognize what it is.