The second tip I have for new parents:
Children don't need to be punished. Ever.
Here's why:
When a child has done something 'wrong' (like broken something, hurt another person, acted dangerously) the real results of their action are sufficient to teach them about life.
Children don't enjoy upsetting or hurting someone else, especially their parents. When you are upset about their behaviour, they know that right away. They don't feel good.
If they've hurt another child, they will witness the pain they have caused when the other child cries. They won't feel good.