Transferring files between PCs

[Roscoe]

I am considering purchasing a new PC and I will want to transfer my many files and jpgs from the old to the new and I was wondering what is the best way to go about it. I wondered if I should use a cable with an RJ45 plug or would a cable with a USB plug be better or does it matter which one I use or is there another better way? Wi-Fi perhaps? If so how do I go about it?

Thanks for your help. It is appreciated.