when i upload an image under continue uploading these three phrase are written: COMMERCIAL RF RF no keywords EDITORIAL who can tell me the difference between them i can't understand them exactly? and which of them is better to choose?
If you choose no keywords your image will be submitted without keywords. This will send the image to the "keymasters" who will add the title, description and keywords to your image. It is not a free service, you will pay 0.6$ for each image you want keyworded by the masters. Many non-native english speakers use this service. It is up to you to decide if it is worth 60 cents per image. You must still provide a general description of your image so the keymasters know where it was taken or what it is about.