Ignorance;
It is the absence of the truth. If you are ignorant, the truths absent in your life. When someone is ignorant,it means that they lack awareness or understanding of a particular subject or concept.
Knowledge;
It is the accumulation of the truth. So, to be knowledgeable is to accumulate truth-principles, facts,or perspectives. However,this is were many people stop. They know a lot, but their live does'nt reflect it. Don't be someone who just accumulates knowledge without using it to improve their lives, this is why many become theorist with nothing to show for life.
Understanding;
it is assimilation of the truth. Understanding goes beyond more accumulation - it involves assimilating the truth. One can accumulate knowledge without truly understanding it. True knowledge transforms into understanding when it is deeply comprehended and integrated into one's thinking and actions. In our current era, many are adapt at accumulating knowledge, often earning them the label of theorists because they lack practical understanding and application.
Wisdom;
It is the application of truth, learning is not knowing if it does not culminate in assimilation and application. Only application proves assimilation. Anything you don't know. Many possess theoretical knowledge but lack the practical wisdom to apply effectively in real life situation.