They help to ripen the cervix apparently. Not sure if they actually work... But it's always worth a try!
Some help soften the cervix & some help dilation. Some things help position baby and some things help produce oxytocin. This is a good read: https://www.peanut-app.io/share/OIjlGihZ1Jb No proof that they actually all work and you don’t need to do any of them at all it’s just thought to help the labour process
To help ease labour and get things moving, the tea is more just to help strengthen things to make it easier but I believe the other two are to get things moving. There’s no 100% that they’re going to help and you don’t need to do these if you don’t want to. Just helps some people x