try to label triggering content and hide it behind a spoiler. In general at least make sure you hide mentions of suicide, self harm, violence, and sexual content.
Don’t discuss specific plans to injure or kill yourself or others. Discussion of general ideation is acceptable. Got something AWFUL to say? Try c/VoidScreaming
Avoid requesting or giving medical advice beyond personal experience. Describing how you personally managed a medication side effect, for instance, is fine.