Sequoia wrote a great email to help their portfolio company prepare and adjust fo the current crisis
Coronavirus: The Black Swan of 2020
and Kima Ventures chose to focus on why speed beats everything when times are tough
A word from Kima - Speed beats Perfection
Here, you can find some actionable tips to quickly execute on what matters
The global economy and its impact on startups in the time of COVID-19 - Fabrice Grinda
For less recent, but just as relevant essays, you can turn to this piece by Paul Graham on how a crisis can foster the creation of internet giants:
Why to Start a Startup in a Bad Economy
and A16Z's article on the impact of crises on CEOs & their leadership