Article linked discusses the basics about the 5 types of insects found in streams: Midges, Mayflies, Caddisflies, Stoneflies, and Terrestrials. A good article to read to get started with insect type ID and how to match and fish the stream based on what you see.
https://thecreekcreature.com/the-5-bugs-of-fly-fishing-entomology-to-know/?fbclid=IwAR3hkOmNI7Q90qvEThMYpwQwjksItQkM9c9Nf7bHRm3rBYTqDVcA7Atei1U
https://thecreekcreature.com/the-5-bugs-of-fly-fishing-entomology-to-know/?fbclid=IwAR3hkOmNI7Q90qvEThMYpwQwjksItQkM9c9Nf7bHRm3rBYTqDVcA7Atei1U
