zeyra wrote:
My new MacBook is not locating the source of my old MacBook in the transition stage and I was wondering what I can do or what is wrong because it has been on the same [loading] page for about an hour and it hasn’t found the source still.
You do not say how you are trying to connect the two machines....
Try a cable connection for best results, try a different cable if you are having an issue.
Alternative move your user data from a different source: Time Machine backup or Boot clone.
The most trouble free way to move to a new machine, is using the Setup Assistant on the initial boot of a brand new machine— you have one shot here. https://support.apple.com/en-us/HT205749
If that opportunity has past, the second best way is use the Migration Assistant.
How to move your content to a new Mac https://support.apple.com/en-us/HT204350