I like using DropBox for this. It's painless to move a file from one folder to the DropBox folder and then on my other computer it magically shows up. At this point you move it on the other computer to the folder you want it to be in.
Now the caveats.
NEVER DRIVE THE NUMBER OF COPIES YOU HAVE DOWN TO ONE LAST COPY.
This is where folk lose files since they have no backups.
SECOND ISSUE. Windows 10's video player doesn't play much out of the box. Go get VLC PLAYER from Ninite.com. Why? Read http://www.howtogeek.com/201354/ninite-is-the-only-safe-place-to-get-windows-freeware/
The hard drive on my Macbook Air has way too much stuff on it. Can I transfer all videos and photos from my Mac to my husbands Dell (windows 10). And if so, HOW? (Neither of us knows much about Windows 10.)

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