Sleep training

I am just curious as to how many parents sleep train? Like let the babies cry it out. My son is 6 months and sleeps through the night but we always have to rock him to sleep he has a really high pitch cry that shakes the house and I know I wouldn’t be able to listen to him crying. I am just wondering if anyone’s Lo kind of just started sleeping on their own without having to let them cry it out.. does anyone have any advice. My husband wants me to leave the house so he can stay with our son while he cry’s it out. I honestly don’t mind rocking him to sleep every night as of now but I guess I don’t want to start any habits that will be hard to break in the future

Thanks in advance