Seeking Guidance for Building a SaaS

I'm looking for guidance on building a SaaS (Software as a Service). I have some ideas but need help with the right tech stack, validating my idea, user authentication, and pricing models.

If you've previously built a SaaS or are currently working on one, I'd love to hear your advice, experiences, and even mistakes you've learned from. Any resources or personal tips would be greatly appreciated.

I'm open to collaborations, and feel free to send recommendations to my DMs!