Hi Christine,
1.
If the 2 PC are in the same location:
Microsoft removed the Homegroup functionality in version 1803 of Windows 10, which makes file transfer a bit more difficult
If you have WiFi in your Home, here is how to set that up:
On each PC, create a new folder. right click that folder and choose properties
Click on the Sharing Tab of the resulting dialog and click 'Share'
Then give that folder a Unique Name on your Network
If you have a problem seeing each PC in the Network Section in File Explorer, check this article out on how to resolve that:
Click your Start Button, type Services and hit Enter
When the Services app opens, scroll down to find the 'Function Discovery Resource Publication' service
Double-click that and set its startup type to Automatic
Then Start that service
Save that and close the Services app
That's It!
2.
If the 2 PC's are not in the same location:
Upload the files to the cloud (OneDrive, DropBox . . . etc.) share those files and send the other person a link and on the second PC, those files can be pulled down from the cloud