Learn English – meet student’s needs or meet student needs

"One's" is one of the "most correct" methods of expressing general possession.

"Your" is more modern, but is considered by a few to be grammatically incorrect because it specifically refers to "you" when you might want to refer to someone in general, and can have a "slang" feeling to it because of this. But, because of it's extremely frequent use, "your" has generally been adopted as being correct.

Either method is valid, and what you use depends on how you want to come across. "Proper" or "modern".

The same applies to the usages of "one" and "you", with "he or she" and "they" being similar replacements.

From Google:

Indefinite pronouns are words which replace nouns without specifying which noun they replace.

Singular: another, anybody, anyone, anything, each, either, everybody, everyone, everything, little, much, neither, nobody, no one, nothing, one, other, somebody, someone, something.

Plural: both, few, many, others, several.

A noun can be used in an indefinite sense to mean "anyone who is" - e.g:

Give it to a student.

Means give it to anyone who is a student. But student is a noun, not a pronoun. Only the words above are indefinite pronouns.