Dear EGGers, I shall help us all better understand which words we need to capitalize in a title. Of course, the orange book was last published in 1993 prior to the Internet's boom. To improve readability, avoid capitalizing all the letters in more than one or two words in headlines and headings. Punctuate headlines like sentences. There are exceptions.
Some people believe that using sentence case, especially for online articles is easier on the eyes.
Others think they should be written differently to stand out. Don't worry, EGGers, I will explain. Most of the capitalization problems in titles are with words that are three letters or less. Rule of thumb is that when a word is greater than three letters, and it is NOT a preposition or a conjunction, then capitalize it. Of course, if you have some creative reason for not capitalizing it, by all means do it.