Most SaaS tutorials only show single-user apps -- but if your product serves teams or businesses, you need multi-tenancy from day one. Here is what it means, why it is so hard to add later, and how a Next.js boilerplate ships it ready to use.
Most B2B SaaS founders lose enterprise deals because they can't say yes to 'can we use our own domain?' -- here is the Next.js middleware pattern for custom domain routing so you can offer white-labeling as a premium tier and close bigger contracts.