There are several ways...............
If you have an SD Card, save them to the card. Go to File manager, and move them. Put the sd card in the new phone and they are there.
If you want to use the computer, plug the phone, using the charge cable, into the computer. Use Windows file manager to copy the files off. You will have to copy the files back to the new phone.
Save your files to Microsoft OneDrive, GoogleDrive, DropBox, etc. Download the app to your phone. Save the files there in the cloud on your OneDrive, etc. When you get the new phone download the app to the phone and copy your files back. This option is good always, and you can set the phone to always upload your files when on wifi so you never lose anything.
Hope that helps!