The particle と (TO) is used to join elements the same way as "and" does. と is repeated after each noun in the enumeration. や (YA) is also possible, but や means that the list is not complete, other elements could be added, whereas と clearly enumerates the exhaustive list.
指輪とネックレスをもらいました。
Yubiwa to nekkuresu o moraimashita.
I received a ring and a necklace.
2.
TO can be translated as “together” or “with” to say that an action takes place with someone else. TO can be followed by 一緒に (ISSHO NI) meaning "together."