market matters the most

Product/market fit means being in a good market with a product that can satisfy that market.

Finding product market fit = focusing on the market first. [...] The problem, i.e. the market, is the real opportunity.

What keyword do people search to get to your site?
Put those keywords into Google Keyword Tool
How many people are searching for this keyword?

Myth #1: Product market fit is always a discrete, big bang event.
Myth #2: It’s patently obvious when you have product/market fit.
Myth #3: Once you achieve product/market fit, you can’t lose it.
Myth #4: Once you have product/market fit, you don’t have to sweat the competition.

hiring before you get product/market fit slows you down, and hiring after you get product/market fit speeds you up.

the cohort retention rate is a fair product/market fit metric.

Flattened Retention Curve (= PMF for some market or audience)

product/market fit is when 40% of your users answered that they would be “very disappointed” without your product (aka Sean Ellis’s leading indicator).

In essence, it's better to make something that a small number of people want a large amount, rather than a product that a large number of people want a small amount.

A good rule of thumb is for consumer products, 25% is a good floor and for B2B SaaS products, 70% is a good floor.

Eric Ries Model vs. Keith Rabois Model

keep the fundamentals the same (80%) while substantially reinventing 20% of the product.

your market doesn’t sit still. It is always moving. These days markets are moving/changing at an accelerating pace. As your market moves, your product needs to move with it making product/market fit a pulse that you need to constantly keep your thumb on.