If you are like me, you probably just listen to advice when it comes to subjects without fully researching it or questioning its validity, especially if it came from a reliable source. For this reason, many years went by with me making all my web images 72dpi. I did this to make sure I was saving as much bytes per image as possible because on the web... optimization is really important. Little did I know I was being anal about something that really made no difference.
I know, many of you are thinking... maybe we should be questioning this tip rather just taking my word at this point because many of us have been brainwashed into believing that 72dpi is the resolution that all monitors display images at and no need to go higher unless you want to add bytes to the file size of the image. This is somewhat true.