Ownership is expressed by the particle no (の). But that between the possesor and possesee. Ie: my book= watashi no hon. No is also used to narrow down locations. Ie: under the table=teeburu no shita. (Not for left and right. That is ni. Migi ni, hidari ni, ect.)

Hi there! watashi-no(polite and both female and male can use this in daily concersation. especially business occasion you should use watashi) boku-no( usually for boy) ore-no(for man, a little rough though really common for man) funny one sessha-no(quite old one) soregashi-no(quite old one, too) There are several "my" in Japanese. But common one for foreigner is watashi-no Keep it up your great job!

"Watashi-no + a noun"="my ~~". "Watashi" means "I", and "no" is the genitive case particle. "Watashi-no" is the most general word for "my", which can be used gender-neutrally, both in the written and the spoken style, while "boku-no"/"ore-no" sound masculine and are normally used by guys, more often in a daily conversation.

thank you guys :)

Watashi no hon.