The document discusses Rule #4 for learning English - learn deeply. It explains that learning deeply means mastering concepts through extensive repetition, not just surface-level memorization. Deep learning ensures information is stored far into the brain so it can't be forgotten and becomes automatic. It recommends focusing on a single lesson for 1-2 weeks, listening daily, to fully understand it before moving on. Only through repetition over long periods can English be learned not just for tests but for real use through automaticity without conscious thought.