Psalm 51:6 (New International Version)
6 Surely you desire truth in the inner parts [a] ;
you teach [b] me wisdom in the inmost place.
Ask your child how they are doing, how was their day at school? Have a conversation. Pay attention. Ask about their friends. Ask what they like to do. Ask them what is popular. Don't treat it like an interview though. Listen. What's similar to when you were growing up? What's changed? The important thing is to show your child that you are open and willing to talk about anything; and to try to be the one who knows your child best.
Prayer Suggestion: Ask God to help you have a sincere conversation with your child.