Irony :/

The question I asked myself is: Do I really understand irony? Honestly, I would have to say I do understand, but at certain times. For example, now that I fully understand that verbal irony is pretty much the same as sarcasm, I feel that is the easiest type of irony to spot. I mean, almost everyone has seen or used sarcasm at least once. The same thing goes for situational irony. Once I’m able to see or read an example, it comes right to me. But then there are times when I have difficulty figuring out whether or not something would be considered irony, especially if it’s dramatic irony. I actually thought that dramatic irony and situational irony were the same thing. Boy was I wrong. Although I know I it’s not right, I still think that they are the same type of irony. So could someone help me out and explain the difference between them to me in a way that would be more beneficial for me? How do I know which is which? Can you give me examples? Anything you can think of would be mean a lot. Once I have a full understanding of humor and all types of irony, it might help me get another step closer to where I want to be with my writing.