What are your biggest learnings about building a SaaS product?

build something fast and start trying to sell it. because only after you start attempting to sell will you discover what people actually want.

Saying no to features is the hardest thing. There are always so many good ideas going around but no time to do it all and you do not want to otherwise, you will end up with a confusing mess of a product that does a little for everyone but does solve the problem entirely for anyone.

Once value proposition is clear, build a proper onboarding flow to gather as much data as you can on customers needs. Ask for pro email at the end. If there's a real market fit with value proposition, they'll let their email.

Talk to your early users constantly. You should be on a first-name basis with them.