The attachment between parent and child is important for the development of the child. If parents fulfill the need of a child, the child will feel connected to this person, which forms a bond between them. A secure attachment will make a child trust the parent, because they know the parent will always try to fulfill the needs. 

To make sure you create a safe bond with the child you have to know how a child develops in attachment.

As a baby they will cry to ask for attention and support, so you know they have a need that needs to be fulfilled. They do this to get food, love, a safe space, ... from the parent. After a while they will even be able to recognize their attachment figures.  

When they grow older, they meet a lot of different people; peers but also other adults. Children between 2 and 4 years old are known for their stubbornness. They want to be independent. It is good to let them try things on their own and stimulate them in this. Make sure to let your child know you're still there for support if they need help.

How older they get the more they will distance them from their attachment figures to go out and explore new things. Give them the space to do this but still be present. They will always go back to their attachment figure if they get scared or stressed. At this moment they will need you to protect them and give them a safe space again.