The approach
Start with the right question.
Define a question, what you can observe, and what would change your mind.
In practice
Make it useful on the water.
A test that fails or remains inconclusive can still teach something useful.
Keep learning
Connect the dots.
Use this guide as a starting point, then compare it with the water you're fishing, the tackle you're using, and your own observations. Good fishing knowledge grows through real practice.