Links to a series of videos focused mainly on microscopic identification of specimens of plant-feeding arthropods (and potential pest species), including sections on mites, thrips, aphids, whiteflies, mealybugs, stink bugs, scale insects, leafhoppers/planthoppers, and some moths/caterpillars.
There are also other ID tools and videos that can be searched for here:
https://idtools.org/identify.php?format%5B%5D=website&keyword=&category=1&sortby=date+DESC