Hello how do I do authentication without Next-Auth or any other auth library?

Hello,

I would like implement a session based authentication in my t3 app but without Next-Auth or any auth library, this might be a dumb question but I really don't know where to start.
I know how to do it using Express, or Fastify though but i don't how to do with this stack and tempalte, is it using Express behind the scenes so I need to use express-session or what.

Thanks.
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