Well it sort of depends, unforutnately I don't think there is really much I can do to help...aside from if they post something I can try to be supportive or IRL I'd try to be supportive and online or IRL if someone seemed to be thinking of suicide or self harm I'd recommend they get help for that...like go to the ER if need be and such. Also sometimes I can relate to peoples experiences so perhaps talking aobut my simular experiences can sometimes help make them feel understood or like someone can relate(maybe those things are somewhat helpful)

But yeah I have a hard enough time helping myself, so not very confident I'd be much help to someone else who's really having a difficult time aside from having understanding of how they feel.