Connect your iPhone to your computer with a USB cable
Unlock your iPhone and tap Trust This Computer if prompted
Open the Photos app on Mac or the Photos app/Import tool on Windows
Select your iPhone from the device list
Choose the pictures you want to transfer
Click Import or Import Selected
Wait for the transfer to finish
On Windows, you can also open File Explorer, select your iPhone, and copy photos from the DCIM folder
On Mac, you can also use Image Capture to import photos from your iPhone
To use iCloud Photos, turn on iCloud Photos on your iPhone and download the pictures from iCloud.com or the Photos app on your computer