public school vs Private school

ni

so can someone tell me the difference between the two ? like seriously. do they learn different stuff . do private school learn more advance stuff. i would really love to know. and whats the average cost because im 18 and would love for my daughter to have the best life i can possibly give her ? i already have a bank account for her (shes only 10 months) i wanna do a trust fund . now im thinking about school . but i honestly dont know whats so special about a private school