Anyone know anything about sleep training?

Jordan

I need some advice. First time mom to a 6 month old. My son HAS to be rocked to sleep because if I just lay him in his crib, he screams and cries and acts hysterical. I would love to still rock him to sleep at night but is there any way I can get him to nap during the day with out being rocked? I also have trouble just letting him cry and I prefer a method of not crying if there is one 😬🤷‍♀️