Is the First Round of Funding Really About Preserving Optionality?

I'm a proponent of long term thinking. So, and i think dorl class sock is one of the one mechanism to get there. I don't know if it's the best mechanism, but i think it's one of them. But my question is, to what extent is the first round of funding really about preserving optionality for the future so you can double and triple down on success? Or is it more aboutfunding the idea fully? Or like, maybe you can walk me through some of the things from the investor, from the ventul capitalist, from your perspective? Yea, i mean, i don't even have a what are the stages, and why would you