This one was mentioned in my MBA Finance class. Cash is the lifeblood of the business. Guard it well for you’ll die without it. Understand your customers’ process to pay. It’s not always cash on the barrel head; especially the government and institutions. They tend to be slow in letting their cash go.
The government wants their fair share so get help understanding the definition of “fair.” Make sure your accountant has experience with startups… one who understands employee stock options and such. Sometimes there are strategies that are “obvious” for sole proprietors that are detrimental to LLC’s.