Most gentle sleep training?

Guys what's the most gentle sleep training method do you know of?? My little one is teething so I don't want to put him through more stress but he's so bad at sleeping (up every couple of hours) that I feel it's important for us to sleep train. He is 6 months and I read 4-6 months is the best time so I really want to start now.

Please share any forms of gentle sleep training you guys have done and it works?

My LO currently starts by sleeping in the crib ( he wakes up often but usually rock him and he goes back to sleep) until around 2-3 when he just won't stop ( even after I feed him) and I usually bring him to bed with me.he then wakes up every couple of hours again

Any help at all is greatly appreciated