My old Windows 10 computer had been running gradually slower and slower, and I have bought a new Windows 10 replacement. I do not know if the old computer is infected with malware or not, but I want to transfer my files from old to new computer in the safest way possible, to avoid infecting the new computer in case the old computer is infected. When I google how to safely transfer files from old to new computer, all results are about curing the old computer. I have no further interest in the old computer other than transferring files to my new computer. Advice on the safest way to do the transfer regardless of the old computer's condition would be very helpful.
It seems to me that the choices for transfer are CD, flash drive, or cloud, and I have read that CD is safer than flash drive. I have about 100 files I want to transfer. Almost all of the files are MS Word or Excel, and I have read that I should avoid transferring any files with the following extensions: