Idk how to help him?

My boyfriend is depressed. I have known this for a while now finally he decided to go back into therapy. He might be prescribed some medication. That should help him with his anxiety and mood swings. I have been there in need of a psychologist and psychiatrist. I however don’t know how to help him or what advice to give him, besides telling him everything will be ok, or telling him the good that happens through out his day. Does anyone have any advice?