Could you please help me to understand Oni vs One? I know Oni for group where are men or men+women, One for only women. What about animals, and things?
Both are for plural personal pronouns, in 3rd person. "One" is used for persons of Female gender, or for all non-personal nouns of ANY Gender
Studentki. One czytaja duzo. (Female) students. They read a lot. Gwozdzie. One sa w szufladzie - Nails. They are in the drawer. Czolgi. One glosno sie poruszaja - Tanks. They move loudly.
"Oni" is used for persons of Male gender. Strazacy. Oni gasza pozary. Firemen. They put out fires. Rolnicy. Oni ciezko pracuja. Farmers. They work hard. Siatkarze. Oni sa wysocy. Netball players. They are tall.
While studying Polish, we had a bit of a laugh that there is one group for men and another group for women, animals and things. Things that make you go "Hmmm."