Be an empathetic and non-judgmental listener when he/she wants to talk about feelings and experiences.
Learn about his/her specific mental health disorder to understand the symptoms better and what he/she is going through.
Support and assist in seeking therapy or counseling when necessary.
If applicable, understand the medication he/she is taking—including its physical and mental health side-effects.
Understand that he/she might need space at times, and respect the need for solitude.
Recognize that recovery takes time, and there may be setbacks along the way.
Be mindful of the words you use and promote a stigma-free environment.
Assist with daily tasks or chores when he/she is struggling to cope.
Encourage healthy habits like exercise, proper nutrition, and regular sleep.
Reassure them (in small gestures) that you're there for them, love them, and are committed to their well-being.