Q: how to download videos and pictures from my IPhone to laptop?

If you synced photos/videos via iTunes from your computer to your iPhone, you delete them by syncing again but using the following instructions from Sync photos from your computer to your iOS device using iTunes - Apple Support

1. In iTunes, locate and click on your device.
2. Click Photos.
3. Choose "Selected albums" and deselect the albums or collections you want to delete.
   To delete all synced photos, deselect "Sync Photos from" and, when asked, click "Remove photos."
4. Click Apply.

Learn how to delete photos and video synced from iTunes when you can't access the originals.

Note that iTunes is NOT used to move photos the other direction (from the iPhone to a computer). Following are instructions for that Import photos and videos from your iPhone, iPad, or iPod touch to your computer - Apple Support