I study english a long time and i know that the word one in english have a lot of meanings and i gonna show some examples:
Talking about someone that you love
She is the only one
Do you like these pants?
I like this one and
Talking about nubers or quantities
I have one dog
So.. lets talk about this topic and if i made writting mistakes please correct me ok?
It is also used for the "second person" point of view when speaking. For example,
One must be diligent in thier studies.