Open the image you want to download
Right-click the image
Select Save image as
Choose the folder where you want to save it
Click Save
If you are on a website that blocks right-clicking, open the image in a new tab first
On a touchscreen, press and hold the image, then tap Save image
To download from Google Photos, open the photo, click the three dots, then click Download
To download from email, open the image attachment, then click Download
To find the saved picture, open the Files app and check the Downloads folder