One day, Tom visited his grandma. She said, "I want to buy gifts online, but I do not know how."

Tom smiled and said, "I will help you, Grandma. We can buy gifts on the computer." They looked at toys and books for her friends.

Tom said, "Grandma, do not tell anyone your card number. Keep it secret." Grandma nodded. "And make a strong password, like a good secret," he added.

Grandma said, "Thank you, Tom. I learn a lot today. I am happy!" They both smiled and finished buying gifts safely.