There is no requirement that you understand anything except how to check that checkbox that says, “yeah, yeah, I promise I read the PDF you sent. Let me trade da options!!!”
Some brokers have different levels of option trading privileges, and require you to attest to a certain amount of experience to get to the highest.
I'm not sure if there are any consequences to lying about your experience, but in principle, you are claiming certain facts in writing, not just saying you read a disclaimer or educational material.
