You can check all the commands using /party help [page]

Commands you need to know about

/party create <name> - Create a new party

/party accept [party] - Accept a party request

/party deny [party] - Deny a party request

/party ask [party] - Ask to join a party

/party chat [on/off] - Toggle on/off to directly send messages in party chat

/partychat or /pc TEXT - To text in the party chat without toggle

/party leave - Leave the party

/party password <new password/remove> - Set/change the password of your party

/party rename [party] <name> - Rename the party

/party kick <player> - Kick a player from the party /party delete <party> - Delete the party