Circuit switching vs packet switching vs messagee switching

I want proper differences with examples which can differentiate them I searched on the Google but I am getting confused more and more
Here's what I think about them 1)In circuit switching a virtual path is created and all entire message is transferred across that path

2)In packet switching In datagram approach , message is broken down into packets and each packet is routed independently. a) It is connectionless approach what exactly this means??

In virtual circuit switching, a virtual path is created and the packets are routed serially over that path . a)It is connection oriented approach what exactly it means?? b) does this method use store and forward mechanism??

I thought store and forward mechanism was just for message switching but I came across a video which explained store and forward mechanism for packet switching and that video too doesn't provide much information