>>323754815
stand next to a group of people talking (make sure it is not too big group because that is hard mode)
listen to conversation, ask yourself (do i know anything of this topic?)
if yes: wait a little bit until something you can pitch in arises and then say it when you see an opening
if no: either find another group of people to listen in on or wait around until topic shifts

good trinity of things to say
something helpful
something nice
something true