There are so many other types of insects that I grouped these into flying and ground insects. There are a wide variety ground insects that are all sizes and come in all colors which include flies and many others. These insects are usually slow moving insects which makes it more simple to photograph and, I usually focus on the subject more that the area around it because of the fine detail that may be seen. These insects have a rich color and more light helps bring that out, so I try different settings with lighting to get the best results.
When I am ready to focus on other ground insects photography, I find that early in the day is a good time to head out. It is cooler outside, and they are usually found in plants and flowers in open areas. When it gets warmer, they tend to hide a little more. I use my full frame or crop camera I have, but I have found that using the Canon 100-400 telephoto or the macro lens works well. I have a soft flash with the diffuse. Many times, I have a camera on the gimbal so moving to the subject helps. Sometimes the subject is pretty focused on the flower or just resting, so this gives me more time to setup a composition. The depth of field I need depends on how complex the background is or if the entire environment needs to be captured.
Again, the kingdom of heaven is like treasure hidden in a field, which a man found and hid; and for joy over it he goes and sells all that he has and buys that field. Matthew 13:44