If you have custody of your child, it is your responsibility to provide for and take care of the child until they reach the age of 18. This means, among other things, that you shall care for the child and ensure they have food, clothes, housing, etc. You are also obliged to protect the child from threats of any kind, and you shall make sure that all of the child’s needs are covered.
If you and the child’s other parent have joint custody of the child, then your decisions shall be made jointly, and you shall mutually take care of the child. However, joint custody does not mean that you must make all decisions jointly. The parent with whom the child has their official address or lives most often is the parent who independently makes a large number of decisions.
If you have sole custody, then you decide what the child will and will not do. For example, you decide the child’s name, where they will live, where they will go to school, their religion, and everything else of significance for the child.
When you have or share custody of a child, you are also a guardian of the child. In other words, you are responsible for the child's income and any assets until they reach the age of 18.