Do you have an idea for a SaaS product, an internal system for employees, a B2B portal for clients, or a custom dashboard for your data? First of all you need to quickly validate whether it works – that's called an MVP (Minimum Viable Product).
My philosophy: build small, fast, with real users. Don't waste 6 months on a feature nobody wanted. An MVP in 8 weeks gives you the answer. If it works, you expand step by step. If it doesn't, the loss is small.
The stack is conservative and proven: Next.js + React + TypeScript on the frontend, PostgreSQL / Supabase with auth out of the box, Stripe for billing, modern cloud infrastructure for hosting. No experimental frameworks – a mainstream production stack that other developers can pick up too.