Porter five forces

I heard that the porter five forces - in case you incur in real exam, is very tricky, lots of grey area that can confuse you.

I want to practice more on this but the curriculum seem not to have much examples or exercises.

How do you guys think about this part?

I think it’s going to be exactly like Ethics, very tricky if they happen to appear in the exam. I am planning to read the case study given in CFAI text and attempt more questions if I get time.