I have a PC and an iPhone. What is the best way to download the photos to the PC?
There are a number of ways to do this. You can use iTunes, and of course you can always email your photos to yourself, and then on your PC you can open the email and save the picture on the PC.
Don't laugh, I actually do that sometimes.
Another way is to open up File Explorer and the iPhone will look like another drive and you can simply copy/cut and paste.
I find using MS Photos to be the easiest way for me. You can simply plug in the USB port and Photos will pop up. You can then copy or cut removing them from the iPhone or not and Photos will store the photos in folders with the date and time.
They all will work. Try and see which is best for you.