Telling another person something God has done for you can encourage them to trust in God to help them out.
Cheer someone up. Even sitting down and listening to someone talk about their day can cheer them up! :)
Share your faith. Tell someone about what God has done for you and about what you believe. That seed may lead to someone accepting Jesus and that is the greatest gift of all.
Don't gossip. It can be hard to not gossip, but doing so hurts other people and is not loving our neighbor as ourselves.
Spend some time with Jesus. Tell Him how much you love Him.
Use your talents to help others and serve God. God made you special. God gave you gifts and talents. Use those things for God purposes. Ask God what He wants you to do with them.
Do extra chores. "Say, what?!" Yes do extra chores. :). This will show your parent(s) or guardian(s) that you really care. Do everything as if you were doing it for God. Example: If your mom asks you to take out the trash, also do the dishes without being asked.
Keep your promises. If you promise you will do something, do it. Jesus tells a parable of two sons. One son says that he will do what his dad wants him to do, but doesn't do it. The other son says he won't do it, but ends up doing it. Wouldn't it be better if you said you would do something and did it?
Be truthful. If you truly love someone, you will be truthful with them. Have you ever had a friend that cared enough about you to tell you the truth about something? Example: If you tell your friend that their zipper is down or they have something on their face, it might save them from embarrassment.