Learn to talk to your baby
Caring for a baby can be frustrating. They need something, so they cry and it's up to the adult to figure out what the baby needs. While it seems like it should be easy to figure out, it's not.
At some point during the process of feeding, changing, playing, rocking and whatever else one can think of the thought will come to mind, "I just wish this baby could just tell me what they want."