Basic: At this level, we are beginners. To move to the next level, we need to learn the common body of knowledge.
Advanced: Now we have learned the standard skills. To improve further, we need to become more familiar with them until they are second nature.
Expert: We have integrated all the knowledge and skills into our intuition. Most people stop once they have reached this level.
But reaching expert level is not the end of the road for everyone; there are some few experts who seek mastery of their field. To do this, we need to know when to break the rules, ignore our knowledge, and reject the usual facts. This blog discusses ways of doing so.