/linkshell [/l]
to speak to you linkshell (guild)

/shout [/sh]
to shout

/tell [/t]
to whisper one person

/party[/p]
to speak to your party

/say[/s]
to say it out loud

/chatmode
How to set what your default chat is. Usually a good idea to set this to linkshell

Ex
/chatmode say
/chatmode shout
/chatmode linkshell