Stay involved. Ask your child about school, their grades, their friends, where they're going and what they're doing. The more involved you are, the less likely they are to get involved with negative influences.
Tips On Parenting (Tip #2)
Be a parent, not a friend. Remember, as a parent you are not trying to be a friend to your child, although all of us would like to be. You need to be doing what is best for their health and safety and try to ensure they have a successful future.
Tips On Parenting (Tip #3)
Practice what you preach. You need to remember that everything you do has an effect on your child. They imitiate parents like you wouldn't believe, so be cautious of what you say and do around them.