- While you can drive users and sales through marketing its important not to get into growth experimentation until you have some sense of product market fit. - VC funding can put enormous pressure to grow, but it's important to prove that users want your product before driving growth. --- One of the cardinal rules of growth hacking is that you must not move into the high-tempo growth experimentation push until you know your product is must-have, why it’s must-have, and to whom it is a must-have: in other words, what is its core value, to which customers, and why. - Ellis and Brown in [[Hacking Growth]]