This morning over a cup of coffee I perused the usual fly fishing blogs... Orvis, ChiWulff, Yellowstoner, and Limp Cobra. The Cobra came through with my favorite of the day, linking me to "a real gem from Alan Bulmer at Active Angling New Zealand for your trout hunting pleasure." It goes into different rise forms (Bulging, Tailing, Sipping) and what the fish is likely to be feeding on.
Here's a link to the full article: https://activeanglingnz.com/2015/09/30/analysing-trout-rise-forms-a-lost-skill/
It's complete with pictures (mmmmm.... pretttyyy), a great little chart, and some good knowledge to shove into your brain bucket. Enjoy.