After leaving Ethiopia, Zinet Kemal and her husband, Aman Hordofo, needed to learn everything about life in Minnesota, from enrolling in college to ordering a pizza. (Pro tip: Don’t try to pay the delivery guy with a $100 bill.) In her new kids’ book, “Proud in Her Hijab: A Story of Family Strength, Empowerment and Identity,” Zinet has her own lesson to offer.