I am new to the Apple Mac. I need to transfer my TurboTax files from my old PC to Mac. How can I selectively transfer files?

I would recommend copying the files you want to an external HD. Most External Hard Disks come pre-formatted for PCs and you can copy to your Mac. Once you are done, then you can use the same External Hard Disk for your Time Machine backup External Hard Disk. You will only need to re-format it which takes all of about 30 seconds to do.

I am going to assume you not familiar with Time Machine so please read Back up your Mac with Time Machine and use it! Operating ANY computer without a good backup plan is a 100% guarantee you will lose data.

First, you will need to install the TurboTax app on your Mac. Be sure that you are able to download a version that is compatible with your operating system. Test it to be sure it's working. TurboTax is sometimes problematic in this area. Then transfer your files. I will assume that the transferred files can then be opened by the Mac TurboTax app, as is the case with Microsoft office.

Being new to Macs, let me make a suggestion. Do Not install ANY anti virus, fixer or cleaner apps. Macs don't need them and in fact they can do more harm than good.