I like the Bessemer,, and in particular this is a good one on CAC/CLTV: .
Your job in a startup is not to "optimize" anything; the goal is to get a concrete product out the door so that your company can become profitable. The idea is not to remain dependent on investors' money.
After shipping a product, your company can still grow as you grow--you are not technically classified as a startup anymore at that point. You can worry...(more)