The approach
Start with the right question.
Search likely depth ranges and cover systematically instead of repeating the same unproductive cast.
In practice
Make it useful on the water.
Track contacts, follows, bites and blank water separately to identify a pattern.
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.