I would like to hear recommendations from experts when uploading images in a post and setting the 'Link URL' field, don't have it clear at all. Right now, just in case, I'm selecting 'None' option after I upload every image.
I understand the second option, 'File URL', points directly to the uploaded file, so when user clicks on the image, the image is shown alone in a blank page (and user sees the complete URL, a bit fuzzy and dangerous?). Is this the usual approach in a blog/website?
And finally, the option I don't understand is the third one, which says 'Attachment Post URL', what the hell does this, similar to the previous one?
So, in general, what's the most common approach across the Internet when setting this image uploading related field?
Thanks and regards,