Write Just Enough Content
There are no "ideal lengths" of content, only enough to satisfy user intent and the context in which they're querying.
WordsI remember when everyone had their favorite best practice of word count. It was a time of keyword density and keywords meta tag stuffing. They were good days, but they had to come to an end (though some still live in that dismal past!).
Here's the real truth about word counts:
Write just enough and not too much!
There really is no ideal length, but there isan ideal question: "Should this page exist?"
The answer should consider primarily:
The page's uniqueness (based on other pages on the site).
Its uniqueness (based on other pages on the web).
Its value to users (does it answer a question they may have? FYI, analytics is your friend for engagement metrics!).
Its accessibility from a site's homepage (via clicks).
The content's ability to provide value with the correct media (image / video / text) so users are potentially inspired to share it!
Nowhere in these criteria does it mention the number of words, the ideal type of media, the density of keywords, or any of the other traditional optimization tactics.
Also, with Google's launch of "long form" modules in the results page, the need not to count words, keywords, paragraphs, and characters is underscored!