Easy baby description

Hi mommies. My baby is turning 4 months old and generally he's an easy baby. He does cry for milk, when he gets bored or wants attention. He laughs and coos when we interact with him. He even "yelled" for attention which is cute. He's a very easy baby but my friend's baby is the opposite. Her baby is inconsolable at times and cries very loudly, she describes it as wailing. I'm just wondering if having an easy baby is normal? Haha. As she keeps saying "your baby is so easy and can self entertain himself". I've heard that first baby is easy, 2nd one is the real deal. Hahaha.