N o t e that someone/anyone can bemused to indicate a limited choice while somebody/anybody has a more general meaning and is never followed by an of-phrase.
Someone (one of them) is sure to come. -Does anyone (one of you) know it? "Would anyone like some cheese and crackers?" asked the hostess.
ONE It is always used as a noun-pronoun. One either indicates a person in the most general sense or; substitutes for any noun previously mentioned (the so-called; prop-word).
One must do one's duty. Nothing clears up one's ideas so much as explaining them.
As seen from the examples, one can be used in the possessive.
However, the indefinite pronoun one is not much used because you can also be employed in a general sense and is more common in spoken English. "One must be careful when driving a car" is possible, but: "You must be careful..." is much more usual.
N o t e that you here applies to no particular person but merely replaces one.
The possessive one's is much more often used.
It is easy to lose one's way in the maze. It is a pity to spend all one's life in the same place.
When used as a prop-word, one is applied to both things and persons and may be used in the plural.
The green one tastes bitter (=4 apple). My little ones are in the garden (= children).
When there is some idea of comparison or selection the pronoun one/ones is often placed after the demonstrative pronouns, but this is not essential except when the demonstrative is followed by an adjective.
That chair is not comfortable; sit in this (one). Don't buy those oranges; buy these (ones). I want a cake. I’ll buy this chocolate one. You carry the light cases; I'll bring these heavy ones.
(One/ones is necessary in the last two examples but optional in the first two.)
The prop-word one can be preceded by the definite article.
Open another drawer, the one (or that) on the left.