I've been using OmniFocus ask my task manager for a good few years now, and I frequently like to search out articles about how other people use it to glean some ideas - and I frequently pick up tips.
As such I have a collection of articles below, most being pages which link to many more articles on that site! I also saved not just the links below, but also articles from the lists of posts websites that I particularly enjoyed or found useful on Pinboard - hopefully this will help you on your OmniFocus journey!