There seem to be a lot of specific examples online -- how to get rid of white space around an equation, how to get rid of white space around a list. Is there no one way to remove these big bands of white space that show up seemingly at random? No initial "tight" setting? Here, one is after a block quotation, one is just between subparagraphs, and one is after an image.
This is TexShop for Mac, v. 3.97.