sleep training tips

Do any moms have any sleep training tips to help baby fall asleep in their own and what to do if they wake up during the night? My baby has to be rocked to sleep because she will just stay awake in her bassinet and then start to fuss. Also she used to sleep though the night but now she wake up once more and is there any tips for what to do when patting them and giving Them the paci won't work? Sometimes if I just leave her to fuss and go back to sleep in her own, she'll completely wake up and just lay there and eventually fuss. Also this could all be due to the 4 month sleep regression 😩