I'm father of a teenager and can share some tips that I'm using while dealing with mine:

Never reveal to them that you wish that they would act progressively like another person. We attempt to satisfy your hopes however it ain't simple.
There are only so many times you can ask them if they are OK before they get annoyed and really are not ok. But, at the same time, tell them you’re there for them. They may roll their eyes but it still secretly means a lot.
Do not crush their dreams. If they tell you what they want to do for a job or hint at it, support them. My parents said that I would never be a website designer and it hurts self-esteem. So be respectful.
Please listen without judgment!! Let us tell you our side of things, try to understand where we are coming from, and don't judge us for our opinions.
Do not ever ever ever threaten to send them back whenever you’re arguing with them. I know to some parents it seems like the equivalent to “ I brought you into this world and I can take you out” and while A parent shouldn’t say that to a child regardless, it is especially problematic for children who were old enough to remember being in the system. We will often take the statement/threat seriously. It causes also makes the kid feel like you don’t really want or love them or that their having a home is reliant on how well behaved and helpful They can be.