1. Watch the lecture in its entirety.   
2. Determine what the main argument is.  In other words, all academic lectures have a key point (unless you have a terrible professor and they ramble on without a clear direction or purpose) that is being supported by evidence, which is what we call the argument.  Figure out what that argument is.  
3. In your discussion post, explain the argument by analyzing the evidence. As you are explaining the argument, you should discuss how that argument is significant for world history.  In other words, tell me why this topic is important for world history.  
4. Next, make a connection between the topic and any political, social, or cultural issue that we face today in the world.  You should explain how and in what ways the past informs or have shaped the present.  
5. Your discussion post should reflect on how you interpret the past and connect it to present events.