Awesome page, learning a lot. As someone who never really understood this song and dance, here's my feedback. I think you should include a more direct explanation of pre- and post- money valuations. Sure, it's really simple: Premoney+money=postmoney, but that doesn't mean it's common knowledge. Second, the explanation of the option pool shuffle is important to understand the example; it shouldn't be a subtext of an asterisk in the second column. I would also recommend being more direct with the definition of effective valuation as well at the time of its introduction.