The yale Peabody museum offers a very useful source because they have a large collection of insects. They, in fact, have millions of bugs in their collection. This collection is useful to compare different kinds of insects.
The Science Olympiads Entomology site is by far the most useful for teaching a class. The reason for this is that it offers detailed resources to use. These range from the anatomy of an insect to how to collect insects.
This site is by far the most informative. It starts off by telling you what entomology is, which is a study of insects. It also tells you what an insect is which is a bug with six legs, and exoskeleton, and 3 distinct body parts. It also gives you a brief history of what exactly entomology is.
NC State's Department of Entomology offers some very useful information. The main information it offers is just basic information on what entomology is. However, the most important information it offers are ways to tell one bug from another using specific traits.
This website is the page for the Department of Entomology at Cornell University. This site gives information on why to study bugs and specific information on pollinators. It also gives you a place to find news relating to Entomology.
When collecting insects you need to take the temperature of the air and of maggot mass. Collect maggots, Pupa, and Flys and put them in fluid to preserve them. Also be sure to collect the insects from many places on the body along with several soil samples.