Talented Ukrainian author Zoya Nikityuk wrote a touching story for The Village, Ukraine, where I gave some advices how to help people in depression. There are a lot of articles about it in English, I don't think we need to translate
May be the main one is never say "You are strong, what happens?", "Get a hold of yourself! Pull yourself together" - it doesn't work. This will lead to the fact that the person will no longer turn to you for help. Perhaps, in general, will no longer seek help and remain in isolation.
https://www.the-village.com.ua/village/city/city-experience/277579-ya-perezhila-depresiyu?fbclid=IwAR06sJ8VBuUPw4TOsw17xAmOYcNH8VPjD07q6QrJIEJhiS1jHNV34h97yL