Save the image you want to search on your device
Go to https://images.google.com
Click the camera icon (Search by image)
Choose one option:
Upload the image file
Paste the image URL
Review the results (similar images, matching pages, and related searches)
If needed, use the filters/options shown to narrow results (size, time, type, etc.)
To search with Google Lens:
Open the Google app or Google Photos
Tap/click Lens
Select the image or point your camera at the image