Ask HN: Founders what are some financial tips you wish you knew starting out?

Don't spend on growth (user acquisition + talent) unless you've nailed the product market fit // retention.

If you don't need it right now -- and I mean really really need it in the sense that it will make you money yesterday -- don't buy it.

Interesting read on budgeting(and how not to do it):

Don't overspend on infrastructure.

That's a very good point. Any advice on how to plan for infrastructure at the time of launch?