Once your child has received an allowance or earned money through their garage sale, help them to manage their money. You can teach them how to break down their money into the following categories: save, spend, invest, donate, expenses.
Teach them to prioritize saving money to ensure future financial safety and security. If they are not financial safe and secure, it will be difficult to help others and spending will be riddled with guilt and stress. Then teach them to pay for their expenses and any debts (perhaps the loan you gave them for the bicycle). Finally, you can talk through how they would like to spend, invest, and donate their money.
Donating, or giving, money looks different for everyone. Some people choose to donate to charities, while others give money to family or friends by paying for dinner or through gifts. Regardless of how your child chooses to give, spending money on others increases happiness.