How do I tag photos in Google Photos?

Swipe up or tap the overflow button at the top right corner. If you have received the update, you will get a ‘People’ section with a ‘Pen’ icon at the right side. Click on the ‘Pen’ icon and you will see a screen with the photo on top, a section for tagged people and below that, faces that are ‘Available to add’.

For More Information Please Refer: https://www.businessinsider.in/tech/apps/how-to/how-to-manually-tag-pictures-in-google-photos/articleshow/72871272.cms