What are the main attributes of the Realist approach to international relations?

Q1: What are the main attributes of the Realist approach to international relations? What about the Neorealist approach? Are there any world events that might be better understood using this theoretical perspective?Q2: What are the main attributes of the Liberal approach to international relations? What about the Neoliberal approach? Which world events that might be better understood using this theoretical perspective?Q3: What are the main attributes of the Constructivist approach to international relations? What about The English School approach? Are there any world events that might be better understood using this theoretical perspective?Q4: How do Marxism and critical theory apply to international relations? How do they compare and contrast with the approaches we have already discussed? Are there any current events or policy issues to which we could apply a Marxist or critical theory lens?Q5: How do the IR theories compare to the theories we have already discussed? How might we utilize these theories in examining world events?